Supposedly, the red badge that shows up on the Calendar icon in the app switcher (and the Dock, if anyone still uses that) represents invitations that you've not dealt with. That's a nice theory, but I have no invitations waiting for me to act on, and I still have a red badge with a "3" in it.

I realize that I can disable the badge, but that seems like taking a hammer and smashing the light on the dashboard, instead of figuring out why it is lit up.

I want to know what (other than invitations waiting) could cause a red badge to show up on the Calendar.app icon. If this is a bug (e.g. where Calendar is failing update its count of invitations) is there any way to fix it? Is there any way to reset it? If it's not a bug, what other entities get counted besides invitations?

  • Do you have any events with reminders setup? Does the Calendar app have any entries in Notification Center? Also, in my experience, badges are prone to weird bugs; you could try force-closing the app and restarting it or rebooting your phone. – danielcg Jun 21 '16 at 21:59
  • It also shows if another party added or changed an event on a shared Calendar. However, if there is nothing showing in the Calendar's top bar concerning that, then my guess is it's a ghost. Try killing the Dock & see if it goes away. In terminal killall -KILL Dock – Tetsujin Jun 22 '16 at 7:12

I had the same issue, disabled and reenabled the icloud account in calendar preferences and it got rid of the phantom badge

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