MacDebug

Verified for macOS Tahoe 26.2

Fix Guide: Tahoe Calendar Events Not Syncing

Symptom: Calendar events you create on your Mac don't appear on your iPhone or iPad, or events created on other devices never show up in macOS Calendar, even though iCloud is enabled.

Why this happens

Tahoe 26.2 refactored the Calendar sync daemon (CalendarAgent) to use CloudKit's new "delta sync" protocol. If your account has conflicting timezone data or corrupt recurring event metadata from older macOS versions, the sync engine silently fails and logs the error to console without user notification.

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Fix 1: Force Calendar Sync

  1. Open Calendar.app.
  2. Go to Calendar > Settings > Accounts.
  3. Select your iCloud account.
  4. Uncheck Calendars, wait 10 seconds, then re-check it.
  5. Quit and reopen Calendar—sync should resume within 30 seconds.

Fix 2: Reset Calendar Cache

For stubborn sync failures:

  1. Quit Calendar.app.
  2. Open Terminal and run:
rm -rf ~/Library/Calendars/Calendar\ Cache*
killall CalendarAgent
  1. Relaunch Calendar.app. It will rebuild the cache from iCloud (may take 2-3 minutes).

Fix 3: Delete Corrupt Recurring Events

If specific events refuse to sync:

  1. Open Calendar.app.
  2. Go to File > New Calendar and create "Test Sync."
  3. Move suspicious recurring events into this calendar.
  4. Right-click the "Test Sync" calendar and Delete.
  5. Check if sync now works—often a single corrupt event blocks the entire queue.

Recommended Tool: BusyCal

If macOS Calendar's sync continues failing, BusyCal uses an independent CloudKit integration that bypasses Apple's buggy CalendarAgent entirely. It also offers superior event creation (natural language parsing), better multi-calendar views, and reliable Google Calendar sync. For business users where missed meetings are costly, BusyCal's robust sync engine is worth every penny.