diff --git a/band-lineup-display/index.html b/band-lineup-display/index.html
index d70b96b..0d23c3e 100644
--- a/band-lineup-display/index.html
+++ b/band-lineup-display/index.html
@@ -57,9 +57,37 @@
                 <option value="">Choose service type</option>
               </select>
               <button type="button" class="btn btn-small" id="btn-pco-sync">Sync Upcoming</button>
+              <button type="button" class="btn btn-small" id="btn-pco-test-birthdays">Test Birthdays</button>
               <button type="button" class="btn btn-small" id="btn-pco-disconnect">Disconnect</button>
             </div>
             <div class="pco-status" id="pco-status">Planning Center is not connected.</div>
+            <div class="pco-status pco-birthday-result" id="pco-birthday-result"></div>
+
+            <div class="bday-block">
+              <div class="bday-head">
+                <span class="bday-title">Birthday Mode 🎂</span>
+                <label class="bday-switch">
+                  <input type="checkbox" id="bday-enabled" />
+                  <span class="bday-switch-label">On</span>
+                </label>
+              </div>
+              <div class="bday-controls" id="bday-controls">
+                <div class="bday-line">
+                  <span class="bday-line-label">Intensity</span>
+                  <div class="seg-inline" id="bday-intensity" role="group" aria-label="Birthday intensity">
+                    <button type="button" data-int="subtle">Subtle</button>
+                    <button type="button" data-int="full">Full</button>
+                  </div>
+                </div>
+                <div class="bday-line">
+                  <span class="bday-line-label">Force on <em>(test)</em></span>
+                  <select id="bday-test" class="pco-select bday-test-select" aria-label="Force birthday on a person for testing">
+                    <option value="">Off</option>
+                  </select>
+                </div>
+                <div class="bday-hint">Birthdays celebrate for the whole service week (Wednesday→Tuesday). Force is for testing only — it clears when the app restarts.</div>
+              </div>
+            </div>
             <div class="pco-position-builder">
               <select id="pco-position-option" class="pco-select" aria-label="Planning Center position">
                 <option value="">Choose position</option>
diff --git a/band-lineup-display/main.js b/band-lineup-display/main.js
index badcc16..4d27d92 100644
--- a/band-lineup-display/main.js
+++ b/band-lineup-display/main.js
@@ -238,6 +238,47 @@ async function pcoRequestJson(target, credentials, searchParams) {
   return payload || { data: [] };
 }
 
+/**
+ * Like pcoRequestJson but never throws on an HTTP error — returns the status so callers can tell
+ * "no access" (401/403) apart from "no such record" (404) apart from success. Used by the People
+ * birthdate probe/fetch, where the whole point is to report what the token is actually allowed to do.
+ */
+async function pcoFetchStatus(target, credentials, searchParams) {
+  const url = buildPcoUrl(target, searchParams);
+  const response = await fetch(url, {
+    headers: {
+      Accept: 'application/json',
+      Authorization: pcoAuthHeader(credentials),
+      'User-Agent': pcoUserAgent(),
+    },
+  });
+  const text = await response.text();
+  let payload = null;
+  try {
+    payload = text ? JSON.parse(text) : null;
+  } catch {
+    payload = null;
+  }
+  return { status: response.status, ok: response.ok, payload };
+}
+
+/**
+ * Fetch one person's birthday from the People API as "MM-DD" (year discarded). Services and People
+ * share the same person id, so the Services person id we already store doubles as the People id.
+ * Returns { status, birthday, fieldPresent } — birthday '' when the field is null/absent.
+ */
+async function pcoFetchBirthday(personId, credentials) {
+  if (!personId) return { status: 0, birthday: '', fieldPresent: false };
+  const { status, ok, payload } = await pcoFetchStatus(
+    `/people/v2/people/${encodeURIComponent(personId)}`,
+    credentials,
+    { 'fields[Person]': 'birthdate' },
+  );
+  if (!ok) return { status, birthday: '', fieldPresent: false };
+  const attrs = payload?.data?.attributes || {};
+  return { status, birthday: normalizeBirthdayMmdd(attrs.birthdate), fieldPresent: 'birthdate' in attrs };
+}
+
 async function pcoFetchAll(target, credentials, searchParams) {
   let nextUrl = buildPcoUrl(target, searchParams).toString();
   const data = [];
@@ -275,6 +316,15 @@ function emptyState() {
     pcoDisplayPositions: [],
     proPresenter: { enabled: false, host: '', port: 0, playlistUuid: '', playlistName: '' },
     displayServer: { enabled: false, port: DEFAULT_DISPLAY_PORT },
+    birthdayMode: { enabled: true, intensity: 'subtle' },
+  };
+}
+
+/** Birthday Mode display settings (the per-person test override is NOT persisted — it lives only in the renderer). */
+function normalizeBirthdayMode(entry) {
+  return {
+    enabled: entry?.enabled === undefined ? true : Boolean(entry.enabled),
+    intensity: entry?.intensity === 'full' ? 'full' : 'subtle',
   };
 }
 
@@ -308,9 +358,26 @@ function normalizeSavedLibraryPerson(person) {
     source: person?.source === 'pco' ? 'pco' : 'local',
     pcoPersonId: typeof person?.pcoPersonId === 'string' ? person.pcoPersonId : '',
     pcoPlanPersonId: typeof person?.pcoPlanPersonId === 'string' ? person.pcoPlanPersonId : '',
+    // "MM-DD" only — we deliberately never persist the birth year (month + day is all
+    // Birthday Mode needs, and it keeps a volunteer's age off this machine). '' = none on file.
+    birthday: normalizeBirthdayMmdd(person?.birthday),
   };
 }
 
+/** Coerce a Planning Center birthdate ("YYYY-MM-DD", or an already-trimmed "MM-DD") to "MM-DD", or '' if absent/invalid. */
+function normalizeBirthdayMmdd(raw) {
+  const s = String(raw || '').trim();
+  const full = s.match(/^\d{4}-(\d{2})-(\d{2})$/); // PCO People birthdate shape
+  if (full) return `${full[1]}-${full[2]}`;
+  const md = s.match(/^(\d{2})-(\d{2})$/);
+  if (md) {
+    const mm = Number(md[1]);
+    const dd = Number(md[2]);
+    if (mm >= 1 && mm <= 12 && dd >= 1 && dd <= 31) return `${md[1]}-${md[2]}`;
+  }
+  return '';
+}
+
 function normalizeTeamName(value) {
   return String(value || '').trim().toLowerCase();
 }
@@ -627,6 +694,20 @@ async function syncUpcomingPcoPlan(payload) {
     return a.displayName.localeCompare(b.displayName, undefined, { sensitivity: 'base' });
   });
 
+  // Pull each scheduled person's birthday from the People API (best-effort: a blocked token or a
+  // person with no date on file just yields '' and never fails the sync). Fetched once per unique
+  // person so a member in two positions isn't queried twice.
+  const birthdayByPerson = new Map();
+  for (const member of scheduledMembers) {
+    if (!member.personId || birthdayByPerson.has(member.personId)) continue;
+    try {
+      const { birthday } = await pcoFetchBirthday(member.personId, credentials);
+      birthdayByPerson.set(member.personId, birthday || '');
+    } catch {
+      birthdayByPerson.set(member.personId, '');
+    }
+  }
+
   const oldPcoFiles = new Set(
     (Array.isArray(baseState.library) ? baseState.library : [])
       .filter((entry) => entry?.source === 'pco' && typeof entry?.fileName === 'string')
@@ -652,6 +733,7 @@ async function syncUpcomingPcoPlan(payload) {
       source: 'pco',
       pcoPersonId: member.personId,
       pcoPlanPersonId: member.planPersonId,
+      birthday: birthdayByPerson.get(member.personId) || '',
     });
   }
 
@@ -731,6 +813,7 @@ async function syncUpcomingPcoPlan(payload) {
   const atWriteTime = await loadStateRaw();
   nextState.proPresenter = normalizeProPresenterConfig(atWriteTime.proPresenter);
   nextState.displayServer = normalizeDisplayServerConfig(atWriteTime.displayServer);
+  nextState.birthdayMode = normalizeBirthdayMode(atWriteTime.birthdayMode);
   await saveStateRaw(nextState);
 
   for (const fileName of oldPcoFiles) {
@@ -1222,6 +1305,7 @@ function migrateState(data) {
       pcoDisplayPositions: normalizePcoDisplayPositions(data.pcoDisplayPositions),
       proPresenter: normalizeProPresenterConfig(data.proPresenter),
       displayServer: normalizeDisplayServerConfig(data.displayServer),
+      birthdayMode: normalizeBirthdayMode(data.birthdayMode),
       lineup: data.lineup.map((e) => {
         if (!e || typeof e !== 'object') return { personId: '', label: '' };
         return {
@@ -1432,7 +1516,10 @@ ipcMain.handle('save-state', async (_e, payload) => {
   // The renderer never edits this (it is changed through the display-* IPC handlers), so
   // always carry the stored value forward rather than letting a save blank it out.
   const displayServer = normalizeDisplayServerConfig(existing.displayServer);
-  await saveStateRaw({ library, layout, parallaxEnabled, slotLabels, slotNames, lineup, pcoServiceTypeId, pcoDisplayPositions, proPresenter, displayServer });
+  const birthdayMode = payload?.birthdayMode
+    ? normalizeBirthdayMode(payload.birthdayMode)
+    : normalizeBirthdayMode(existing.birthdayMode);
+  await saveStateRaw({ library, layout, parallaxEnabled, slotLabels, slotNames, lineup, pcoServiceTypeId, pcoDisplayPositions, proPresenter, displayServer, birthdayMode });
   return true;
 });
 
@@ -1511,6 +1598,85 @@ ipcMain.handle('pco-sync-upcoming-plan', async (_e, payload) => {
   return syncUpcomingPcoPlan(payload);
 });
 
+/**
+ * Diagnostic behind the "Test Birthdays" button: does this Personal Access Token actually reach the
+ * People API and read birthdates, and how many synced band members have one on file. Read-only.
+ */
+ipcMain.handle('pco-test-birthdays', async () => {
+  const credentials = await loadPcoCredentials();
+  if (!credentials) return { connected: false };
+
+  // 1. Can the token read the People API at all?
+  let probe;
+  try {
+    probe = await pcoFetchStatus('/people/v2/people', credentials, { per_page: 1, 'fields[Person]': 'birthdate' });
+  } catch (err) {
+    return { connected: true, canRead: false, reason: 'network', detail: err instanceof Error ? err.message : String(err) };
+  }
+  if (!probe.ok) {
+    const detail =
+      probe.payload?.errors?.map((e) => e.detail || e.title).filter(Boolean).join(' | ') ||
+      `${probe.status}`;
+    return { connected: true, canRead: false, status: probe.status, detail };
+  }
+  const sampleAttrs = probe.payload?.data?.[0]?.attributes || null;
+  const fieldExposed = sampleAttrs ? 'birthdate' in sampleAttrs : true;
+
+  // 2. Coverage across the people we've actually synced (unique by person id).
+  const state = await loadStateRaw();
+  const seen = new Set();
+  const targets = [];
+  for (const p of Array.isArray(state.library) ? state.library : []) {
+    if (p?.source !== 'pco' || !p?.pcoPersonId || seen.has(p.pcoPersonId)) continue;
+    seen.add(p.pcoPersonId);
+    targets.push(p);
+  }
+
+  let withBirthday = 0;
+  let notFound = 0;
+  let errors = 0;
+  const found = [];
+  for (const p of targets) {
+    let r;
+    try {
+      r = await pcoFetchBirthday(p.pcoPersonId, credentials);
+    } catch {
+      errors += 1;
+      continue;
+    }
+    if (r.status === 404) { notFound += 1; continue; }
+    if (r.status && r.status >= 400) { errors += 1; continue; }
+    if (r.birthday) {
+      withBirthday += 1;
+      found.push({ name: String(p.lastName || p.originalName || 'Unknown').trim() || 'Unknown', mmdd: r.birthday });
+    }
+  }
+
+  // Soonest upcoming birthday, for a concrete "it works" line.
+  const today = new Date();
+  const daysUntil = (mmdd) => {
+    const [mm, dd] = mmdd.split('-').map(Number);
+    let next = new Date(today.getFullYear(), mm - 1, dd);
+    const midnight = new Date(today.getFullYear(), today.getMonth(), today.getDate());
+    if (next < midnight) next = new Date(today.getFullYear() + 1, mm - 1, dd);
+    return Math.round((next - midnight) / 86400000);
+  };
+  const sortedFound = [...found].sort((a, b) => daysUntil(a.mmdd) - daysUntil(b.mmdd));
+  const nextUp = sortedFound[0] ? { ...sortedFound[0], inDays: daysUntil(sortedFound[0].mmdd) } : null;
+
+  return {
+    connected: true,
+    canRead: true,
+    fieldExposed,
+    total: targets.length,
+    withBirthday,
+    notFound,
+    errors,
+    found: sortedFound.slice(0, 8),
+    nextUp,
+  };
+});
+
 ipcMain.handle('pp-status', async () => {
   return {
     enabled: ppConfig.enabled,
diff --git a/band-lineup-display/package.json b/band-lineup-display/package.json
index 209618c..5bffa80 100644
--- a/band-lineup-display/package.json
+++ b/band-lineup-display/package.json
@@ -1,8 +1,8 @@
 {
   "name": "band-lineup-display",
   "productName": "Band Lineup",
-  "version": "1.3.6",
-  "buildNumber": "92",
+  "version": "1.3.10",
+  "buildNumber": "96",
   "description": "Stage lineup photos with mic/pack labels",
   "main": "main.js",
   "scripts": {
diff --git a/band-lineup-display/preload.js b/band-lineup-display/preload.js
index 627a24f..f999761 100644
--- a/band-lineup-display/preload.js
+++ b/band-lineup-display/preload.js
@@ -14,6 +14,7 @@ contextBridge.exposeInMainWorld('lineup', {
   pcoServiceTypes: () => ipcRenderer.invoke('pco-service-types'),
   pcoPositionOptions: (serviceTypeId) => ipcRenderer.invoke('pco-position-options', serviceTypeId),
   pcoSyncUpcomingPlan: (payload) => ipcRenderer.invoke('pco-sync-upcoming-plan', payload),
+  pcoTestBirthdays: () => ipcRenderer.invoke('pco-test-birthdays'),
   onMenuAddPhotos: (cb) => {
     ipcRenderer.on('menu-add-photos', () => cb());
   },
diff --git a/band-lineup-display/renderer.js b/band-lineup-display/renderer.js
index f756de2..634d634 100644
--- a/band-lineup-display/renderer.js
+++ b/band-lineup-display/renderer.js
@@ -3,7 +3,7 @@ if (window.__bandLineupRendererLoaded) {
 } else {
   window.__bandLineupRendererLoaded = true;
 /**
- * @typedef {{ id: string, fileName: string, originalName: string, lastLabel: string, lastName: string, source?: string, pcoPersonId?: string, pcoPlanPersonId?: string }} LibraryPerson
+ * @typedef {{ id: string, fileName: string, originalName: string, lastLabel: string, lastName: string, source?: string, pcoPersonId?: string, pcoPlanPersonId?: string, birthday?: string }} LibraryPerson
  * @typedef {{ personId: string, label: string }} StageSlot
  * @typedef {{ teamName: string, positionName: string, count: number }} PcoDisplayPosition
  */
@@ -27,6 +27,10 @@ let pcoDisplayPositions = [];
 let pcoPositionOptions = [];
 let slotLabelMemory = [];
 let slotNameMemory = [];
+/** Birthday Mode display settings (persisted). */
+let birthdayMode = { enabled: true, intensity: 'subtle' };
+/** Person id forced into Birthday Mode for testing — in-memory only, never saved, clears on restart. */
+let birthdayTestPersonId = '';
 /** @type {StageSlot[]} */
 let stageSlots = createEmptySlots();
 const imageUrlCache = new Map();
@@ -65,7 +69,13 @@ const btnApplyLayout = document.getElementById('btn-apply-layout');
 const btnToggleParallax = document.getElementById('btn-toggle-parallax');
 const btnPcoConnect = document.getElementById('btn-pco-connect');
 const btnPcoSync = document.getElementById('btn-pco-sync');
+const btnPcoTestBirthdays = document.getElementById('btn-pco-test-birthdays');
 const btnPcoDisconnect = document.getElementById('btn-pco-disconnect');
+const pcoBirthdayResult = document.getElementById('pco-birthday-result');
+const bdayEnabled = document.getElementById('bday-enabled');
+const bdayIntensity = document.getElementById('bday-intensity');
+const bdayControls = document.getElementById('bday-controls');
+const bdayTestSelect = document.getElementById('bday-test');
 const btnPcoAddPosition = document.getElementById('btn-pco-add-position');
 const inputLayoutCols = document.getElementById('layout-cols');
 const inputLayoutRows = document.getElementById('layout-rows');
@@ -244,6 +254,7 @@ function setPcoStatus(message, isError = false) {
 function setPcoControlsEnabled(enabled) {
   btnPcoConnect.disabled = !enabled;
   btnPcoSync.disabled = !enabled;
+  btnPcoTestBirthdays.disabled = !enabled;
   btnPcoDisconnect.disabled = !enabled;
   btnPcoAddPosition.disabled = !enabled;
   pcoServiceTypeSelect.disabled = !enabled;
@@ -427,6 +438,9 @@ function applyLoadedState(data) {
         source: person?.source === 'pco' ? 'pco' : 'local',
         pcoPersonId: typeof person?.pcoPersonId === 'string' ? person.pcoPersonId : '',
         pcoPlanPersonId: typeof person?.pcoPlanPersonId === 'string' ? person.pcoPlanPersonId : '',
+        // Carried through so a routine save doesn't wipe birthdays a PCO sync stored (main.js
+        // re-validates the "MM-DD" shape on write); Birthday Mode reads this.
+        birthday: typeof person?.birthday === 'string' ? person.birthday : '',
       }))
     : [];
   const savedColumns = Number.parseInt(String(data?.layout?.columns ?? DEFAULT_COLUMNS), 10);
@@ -451,6 +465,11 @@ function applyLoadedState(data) {
   pcoServiceTypeSelect.value = pcoServiceTypeId;
   renderPcoDisplayPositions();
   stageSlots = normalizeLineup(data.lineup, getStageSlotCount());
+  birthdayMode = {
+    enabled: data?.birthdayMode?.enabled === undefined ? true : Boolean(data.birthdayMode.enabled),
+    intensity: data?.birthdayMode?.intensity === 'full' ? 'full' : 'subtle',
+  };
+  syncBirthdayControls();
 }
 
 function updateSlotSizeReadout() {
@@ -528,6 +547,7 @@ function scheduleSave() {
       slotLabels: slotLabelMemory,
       slotNames: slotNameMemory,
       lineup: stageSlots,
+      birthdayMode,
     });
   }, 250);
 }
@@ -950,6 +970,132 @@ function parallaxMotionVars(seedText) {
   };
 }
 
+/* ---------------- Birthday Mode ---------------- */
+
+const BIRTHDAY_COLORS = ['#f5c451', '#ff6b81', '#4fd1c5', '#a78bfa', '#ffffff'];
+/** Live confetti canvases; a single rAF loop drives them and prunes any whose tile was rebuilt. */
+const birthdayCanvases = new Set();
+let birthdayRaf = null;
+
+/**
+ * The 7 "MM-DD" dates of the current celebration week, which runs Wednesday→Tuesday. A birthday
+ * anywhere in this window celebrates all week (so it's already up for the weekend services).
+ * Cached per week; birthdayTick() re-renders the stage when the window rolls over to a new Wednesday.
+ */
+let birthdayWeekCache = { key: '', set: null };
+function birthdayWeekSet() {
+  const now = new Date();
+  const daysSinceWed = (now.getDay() - 3 + 7) % 7; // getDay: Sun=0…Wed=3…Sat=6
+  const start = new Date(now.getFullYear(), now.getMonth(), now.getDate() - daysSinceWed);
+  const key = `${start.getFullYear()}-${start.getMonth()}-${start.getDate()}`;
+  if (birthdayWeekCache.key === key && birthdayWeekCache.set) return birthdayWeekCache.set;
+  const set = new Set();
+  for (let i = 0; i < 7; i += 1) {
+    const d = new Date(start.getFullYear(), start.getMonth(), start.getDate() + i);
+    set.add(`${String(d.getMonth() + 1).padStart(2, '0')}-${String(d.getDate()).padStart(2, '0')}`);
+  }
+  birthdayWeekCache = { key, set };
+  return set;
+}
+
+/** Is this person celebrating this week — their birthday falls in the current Wed→Tue window, or they're the test override. */
+function isBirthdayActive(person) {
+  if (!birthdayMode.enabled || !person) return false;
+  if (birthdayTestPersonId && person.id === birthdayTestPersonId) return true;
+  return typeof person.birthday === 'string' && person.birthday.length === 5 && birthdayWeekSet().has(person.birthday);
+}
+
+/** Re-render the stage when the celebration week rolls over (the app can stay open for days). */
+function birthdayTick() {
+  const before = birthdayWeekCache.key;
+  birthdayWeekSet();
+  if (before && birthdayWeekCache.key !== before) void renderStage();
+}
+setInterval(birthdayTick, 15 * 60 * 1000);
+
+function birthdayMakeParticle(w, h, intensity, seedY) {
+  const ribbon = Math.random() < 0.55;
+  return {
+    x: Math.random() * w,
+    y: seedY != null ? seedY : Math.random() * h,
+    w: ribbon ? 4 + Math.random() * 4 : 5 + Math.random() * 5,
+    h: ribbon ? 9 + Math.random() * 8 : 0,
+    ribbon,
+    color: BIRTHDAY_COLORS[(Math.random() * BIRTHDAY_COLORS.length) | 0],
+    rot: Math.random() * Math.PI * 2,
+    vr: -0.14 + Math.random() * 0.28,
+    sway: 0.6 + Math.random() * 1.1,
+    phase: Math.random() * Math.PI * 2,
+    vy: (intensity === 'subtle' ? 0.6 : 1.0) * (1.1 + Math.random() * 1.5),
+  };
+}
+
+function birthdaySeedCanvas(c, w, h) {
+  const base = c._intensity === 'subtle' ? 26 : 64;
+  const count = Math.max(10, Math.round((base * (w * h)) / (300 * 500)));
+  c._parts = Array.from({ length: count }, () => birthdayMakeParticle(w, h, c._intensity));
+}
+
+// The confetti ALWAYS animates — this is a celebration effect, so it intentionally ignores the
+// OS "reduced motion" setting (which was freezing the confetti mid-fall on the backstage machine).
+function birthdayStepCanvas(c) {
+  const w = c.clientWidth;
+  const h = c.clientHeight;
+  if (!w || !h) return; // not laid out yet — try again next frame
+  const dpr = Math.min(window.devicePixelRatio || 1, 2);
+  if (c._w !== w || c._h !== h) {
+    c.width = w * dpr;
+    c.height = h * dpr;
+    c._ctx = c.getContext('2d');
+    c._ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
+    c._w = w;
+    c._h = h;
+    birthdaySeedCanvas(c, w, h);
+  }
+  const ctx = c._ctx;
+  ctx.clearRect(0, 0, w, h);
+  for (const p of c._parts) {
+    p.phase += 0.03;
+    p.y += p.vy;
+    p.x += Math.sin(p.phase) * p.sway;
+    p.rot += p.vr;
+    if (p.y > h + 16) Object.assign(p, birthdayMakeParticle(w, h, c._intensity, -16));
+    ctx.save();
+    ctx.translate(p.x, p.y);
+    ctx.rotate(p.rot);
+    ctx.fillStyle = p.color;
+    if (p.ribbon) ctx.fillRect(-p.w / 2, -p.h / 2, p.w, p.h);
+    else { ctx.beginPath(); ctx.arc(0, 0, p.w / 2, 0, Math.PI * 2); ctx.fill(); }
+    ctx.restore();
+  }
+}
+
+function birthdayLoop() {
+  for (const c of [...birthdayCanvases]) {
+    if (!c.isConnected) { birthdayCanvases.delete(c); continue; }
+    birthdayStepCanvas(c);
+  }
+  birthdayRaf = birthdayCanvases.size ? window.requestAnimationFrame(birthdayLoop) : null;
+}
+
+function birthdayRegisterCanvas(canvas, intensity) {
+  canvas._intensity = intensity;
+  birthdayCanvases.add(canvas);
+  if (!birthdayRaf) birthdayRaf = window.requestAnimationFrame(birthdayLoop);
+}
+
+/** Rain confetti (plus a soft gold glow) onto a tile whose person is celebrating. */
+function applyBirthdayEffects(tile, photoArea) {
+  const intensity = birthdayMode.intensity === 'full' ? 'full' : 'subtle';
+  tile.classList.add('birthday', `birthday-${intensity}`);
+
+  const confetti = document.createElement('canvas');
+  confetti.className = 'birthday-confetti';
+  confetti.setAttribute('aria-hidden', 'true');
+  photoArea.appendChild(confetti);
+  birthdayRegisterCanvas(confetti, intensity);
+}
+
 function createPhotoTile(person, href, slotIndex, parallaxAssets) {
   void parallaxAssets;
   const tile = document.createElement('article');
@@ -1002,6 +1148,7 @@ function createPhotoTile(person, href, slotIndex, parallaxAssets) {
 
   photoArea.appendChild(nameBadge);
   photoArea.appendChild(removeBtn);
+  if (isBirthdayActive(person)) applyBirthdayEffects(tile, photoArea);
   tile.appendChild(photoArea);
   return tile;
 }
@@ -1156,6 +1303,7 @@ async function renderLibrary() {
 async function renderAll() {
   await renderStage();
   await renderLibrary();
+  renderBirthdayTestOptions();
 }
 
 async function importNewPeople(added) {
@@ -1170,6 +1318,7 @@ async function importNewPeople(added) {
       source: 'local',
       pcoPersonId: '',
       pcoPlanPersonId: '',
+      birthday: '',
     });
   }
   await renderLibrary();
@@ -1232,6 +1381,97 @@ async function syncUpcomingPlanFromPco() {
   }
 }
 
+const BIRTHDAY_MONTHS = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
+function formatBirthdayMmdd(mmdd) {
+  const parts = String(mmdd || '').split('-');
+  const mm = Number(parts[0]);
+  const dd = Number(parts[1]);
+  if (!(mm >= 1 && mm <= 12) || !(dd >= 1 && dd <= 31)) return '';
+  return `${BIRTHDAY_MONTHS[mm - 1]} ${dd}`;
+}
+
+function setPcoBirthdayResult(message, tone) {
+  if (!pcoBirthdayResult) return;
+  pcoBirthdayResult.textContent = message || '';
+  pcoBirthdayResult.style.display = message ? '' : 'none';
+  pcoBirthdayResult.style.color = tone === 'error' ? '#ffb1b1' : tone === 'good' ? '#8fe0b0' : '#9ea7bc';
+}
+
+async function testPcoBirthdays() {
+  setPcoControlsEnabled(false);
+  setPcoBirthdayResult('Checking Planning Center for birthday access…', 'info');
+  try {
+    const r = await window.lineup.pcoTestBirthdays();
+    if (!r || r.connected === false) {
+      setPcoBirthdayResult('Connect Planning Center first, then test birthday access.', 'error');
+      return;
+    }
+    if (!r.canRead) {
+      const why = r.reason === 'network'
+        ? `Couldn't reach Planning Center (${r.detail || 'network error'}).`
+        : `This token can't read People birthdays${r.status ? ` (HTTP ${r.status})` : ''}${r.detail ? ` — ${r.detail}` : ''}.`;
+      setPcoBirthdayResult(`✕ ${why} Birthday Mode needs People access on the token.`, 'error');
+      return;
+    }
+    // Access works. Report coverage across synced band members.
+    if (r.total === 0) {
+      setPcoBirthdayResult('✓ People access works. Sync an upcoming plan, then test again to see how many musicians have a birthday on file.', 'good');
+      return;
+    }
+    const bits = [`✓ People access works — ${r.withBirthday} of ${r.total} synced ${r.total === 1 ? 'person has' : 'people have'} a birthday on file.`];
+    if (r.nextUp) {
+      const when = r.nextUp.inDays === 0 ? 'today 🎂' : r.nextUp.inDays === 1 ? 'tomorrow' : `in ${r.nextUp.inDays} days`;
+      bits.push(`Next up: ${r.nextUp.name} (${formatBirthdayMmdd(r.nextUp.mmdd)}, ${when}).`);
+    }
+    if (r.notFound) bits.push(`${r.notFound} not matched in People.`);
+    setPcoBirthdayResult(bits.join(' '), r.withBirthday > 0 ? 'good' : 'info');
+  } catch (error) {
+    setPcoBirthdayResult(error instanceof Error ? error.message : 'Birthday test failed.', 'error');
+  } finally {
+    setPcoControlsEnabled(true);
+  }
+}
+
+/* ---------------- Birthday Mode controls ---------------- */
+
+/** Reflect current birthdayMode settings onto the controls (called after load). */
+function syncBirthdayControls() {
+  if (bdayEnabled) bdayEnabled.checked = birthdayMode.enabled;
+  if (bdayIntensity) {
+    for (const b of bdayIntensity.querySelectorAll('button')) {
+      b.setAttribute('aria-pressed', b.dataset.int === birthdayMode.intensity ? 'true' : 'false');
+    }
+  }
+  if (bdayControls) bdayControls.style.opacity = birthdayMode.enabled ? '' : '0.45';
+}
+
+/** Rebuild the "Force on (test)" dropdown from whoever is currently on the stage. */
+function renderBirthdayTestOptions() {
+  if (!bdayTestSelect) return;
+  const previous = birthdayTestPersonId;
+  bdayTestSelect.innerHTML = '<option value="">Off</option>';
+  const seen = new Set();
+  stageSlots.forEach((slot, index) => {
+    if (!slot.personId || seen.has(slot.personId)) return;
+    const person = getPerson(slot.personId);
+    if (!person) return;
+    seen.add(slot.personId);
+    const option = document.createElement('option');
+    option.value = person.id;
+    const name = String(getStageName(index, person) || person.lastName || 'Unknown').trim();
+    const label = String(slotLabelMemory[index] || '').trim();
+    option.textContent = label ? `${name} — ${label}` : name;
+    bdayTestSelect.appendChild(option);
+  });
+  // Keep the current override selected if that person is still on stage; otherwise drop it.
+  if (previous && seen.has(previous)) {
+    bdayTestSelect.value = previous;
+  } else if (previous) {
+    birthdayTestPersonId = '';
+    bdayTestSelect.value = '';
+  }
+}
+
 /* ---------------- Setup panel tabs ---------------- */
 
 /** Set while a tab switch blurs the port field, so the blur handler doesn't commit. */
@@ -1257,6 +1497,7 @@ function activatePanelTab(name) {
   }
   // The readout measures a stage slot, so it can only be filled in once its pane is laid out.
   if (name === 'pictures') window.requestAnimationFrame(updateSlotSizeReadout);
+  if (name === 'pco') renderBirthdayTestOptions();
 }
 
 /* ---------------- Studio displays (hosting the Now/Next page on the LAN) ---------------- */
@@ -1733,6 +1974,36 @@ btnPcoSync.addEventListener('click', () => {
   void syncUpcomingPlanFromPco();
 });
 
+btnPcoTestBirthdays.addEventListener('click', () => {
+  revealChrome();
+  void testPcoBirthdays();
+});
+
+if (bdayEnabled) {
+  bdayEnabled.addEventListener('change', () => {
+    birthdayMode.enabled = bdayEnabled.checked;
+    syncBirthdayControls();
+    scheduleSave();
+    void renderStage();
+  });
+}
+if (bdayIntensity) {
+  bdayIntensity.addEventListener('click', (e) => {
+    const btn = e.target.closest('button[data-int]');
+    if (!btn) return;
+    birthdayMode.intensity = btn.dataset.int === 'full' ? 'full' : 'subtle';
+    syncBirthdayControls();
+    scheduleSave();
+    void renderStage();
+  });
+}
+if (bdayTestSelect) {
+  bdayTestSelect.addEventListener('change', () => {
+    birthdayTestPersonId = bdayTestSelect.value || '';
+    void renderStage();
+  });
+}
+
 btnPcoDisconnect.addEventListener('click', async () => {
   revealChrome();
   setPcoControlsEnabled(false);
@@ -1744,6 +2015,7 @@ btnPcoDisconnect.addEventListener('click', async () => {
     renderPcoPositionOptions();
     scheduleSave();
     setPcoStatus('Planning Center disconnected.');
+    setPcoBirthdayResult('');
   } catch (error) {
     setPcoStatus(error instanceof Error ? error.message : 'Could not disconnect Planning Center.', true);
   } finally {
diff --git a/band-lineup-display/styles.css b/band-lineup-display/styles.css
index 256ccef..a53169f 100644
--- a/band-lineup-display/styles.css
+++ b/band-lineup-display/styles.css
@@ -331,6 +331,105 @@ body {
   color: #9ea7bc;
 }
 
+.pco-birthday-result {
+  min-height: 0;
+  line-height: 1.45;
+}
+
+.pco-birthday-result:empty {
+  display: none;
+}
+
+/* ---- Birthday Mode settings ---- */
+.bday-block {
+  margin-top: 14px;
+  border-top: 1px solid #23232c;
+  padding-top: 12px;
+}
+.bday-head {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+}
+.bday-title {
+  font-size: 13px;
+  font-weight: 700;
+  color: #e7e7ef;
+}
+.bday-switch {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  cursor: pointer;
+  font-size: 12px;
+  color: #9ea7bc;
+}
+.bday-controls {
+  margin-top: 10px;
+  display: flex;
+  flex-direction: column;
+  gap: 10px;
+}
+.bday-line {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  flex-wrap: wrap;
+}
+.bday-line-label {
+  font-size: 11px;
+  letter-spacing: 0.06em;
+  text-transform: uppercase;
+  color: #8a8a99;
+  min-width: 74px;
+}
+.bday-line-label em {
+  font-style: normal;
+  text-transform: none;
+  letter-spacing: 0;
+  color: #6d6d7a;
+}
+.seg-inline {
+  display: inline-flex;
+  gap: 4px;
+  background: #0e0e14;
+  border: 1px solid #23232c;
+  border-radius: 9px;
+  padding: 3px;
+}
+.seg-inline button {
+  appearance: none;
+  border: 0;
+  background: transparent;
+  color: #9ea7bc;
+  font: inherit;
+  font-size: 12px;
+  font-weight: 600;
+  padding: 5px 12px;
+  border-radius: 6px;
+  cursor: pointer;
+}
+.seg-inline button[aria-pressed="true"] {
+  background: #f5c451;
+  color: #241a02;
+}
+.bday-check {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  font-size: 12px;
+  color: #c6cada;
+  cursor: pointer;
+}
+.bday-test-select {
+  flex: 1;
+  min-width: 150px;
+}
+.bday-hint {
+  font-size: 11px;
+  color: #6d6d7a;
+}
+
 .pco-position-builder {
   display: none;
   grid-template-columns: minmax(0, 1fr) auto;
@@ -624,6 +723,33 @@ body {
   font-weight: 500;
 }
 
+/* ---- Birthday Mode tile effects ---- */
+.tile.birthday-subtle {
+  animation: bdayGlowSubtle 3.4s ease-in-out infinite;
+}
+.tile.birthday-full {
+  animation: bdayGlowFull 2.2s ease-in-out infinite;
+}
+@keyframes bdayGlowSubtle {
+  0%, 100% { box-shadow: inset 0 0 0 2px rgba(245, 196, 81, 0.55), 0 0 14px rgba(245, 196, 81, 0.18); }
+  50% { box-shadow: inset 0 0 0 2px rgba(245, 196, 81, 0.85), 0 0 20px rgba(245, 196, 81, 0.32); }
+}
+@keyframes bdayGlowFull {
+  0%, 100% { box-shadow: inset 0 0 0 3px rgba(245, 196, 81, 0.8), 0 0 20px rgba(245, 196, 81, 0.42); }
+  50% { box-shadow: inset 0 0 0 3px #ffd873, 0 0 34px rgba(245, 196, 81, 0.66); }
+}
+
+/* Birthday Mode intentionally keeps animating even under OS "reduced motion" — it's a celebration
+   the operator opts into, and freezing it leaves confetti stuck mid-fall. */
+
+.birthday-confetti {
+  position: absolute;
+  inset: 0;
+  z-index: 2;
+  pointer-events: none;
+}
+
+
 .tile .remove {
   position: absolute;
   top: 6px;