all events on my calendar disappeared from my Mac
iCloud calendar on mac will not refresh or sync. All events have disappeared on Mac, although they show up on other devices
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See the article Sync iPhone with your computer - Apple Support
Read the section - Set up syncing between your Mac and iPhone
- Select “Sync [content type] onto [device name].”
- By default, all items of a content type are synced, but you can choose to sync individual items, such as selected music, movies, books, or calendars.
The events created / saved in iPhone will automatically synced with Mac .
Read the articles Keep your Calendar up to date with iCloud – Apple Support
If your iCloud Contacts, Calendars or Reminders won’t sync – Apple Support