Why Is my Calendar App not working on macOS Sequoia?

It seems that my calendar is an issue when I drag the calendar view over to my second screen. If I open Calendar and leave it on my primary screen (MacBook Pro), it doesn't close down prematurely. I have tried reinstalling Sequoia, but that didnt work. I have tried opening in Safe Mode. Didnt work. So, I will stick with leaving the Calendar view on the main Mac screen and hope for a fix in an update.

ehatcher wrote:

Since installing Sequoia OS yesterday my computer is freezing and I cannot use calendar app - any suggestions on how to fix or uninstall and revert back to my old OS?

Does it freeze under any other conditions(?) this is unclear from your wording...

If it directly correlated to Calendar.app — quite Calendar and relaunch it holding the Shift key down and compare your results.

no resolve—

A SafeBoot Use safe mode on your Mac - Apple Support will sort many anomalies

Login and test. Reboot as normal and test.

I am adding my experience so they can fix this as well. I sync my calendar to Google and Outlook, and I think with the new reminders update, when I look at my calendar in the monthly view, It looks completely disorganised and glitched. I added an image. Please fix this ASAP I use my calendar to organise my whole life

Following, same my iCal is completely messed up, declined or deleted invites wont go away and have a "read only" at the bottom, those invites will not delete. I have installed and re-installed the account it is linked to and cannot get the calendar to sync since installing Sequoia.

That is exactly what is happening to me too.

For now, I am just logging into iCloud.com and using my calendar inside Safari. It is synching properly with my iPhone and my iPad which is what I need. In the meantime I am just waiting for the next Sequoia update in the hope that it will fix Calendar on my Mac.

Just like Big_Mac_Fan said, I have iCloud calendar with Google calendar synced to it, nothing fancy, and Calendar app freezes every time I open it.

Here is what worked for me.

in Mail, Click on Mail, then click on Accounts

Select the account that is not syncing correctly and turn off Calendar. It then asked if I wanted to delete all from my Mac, (yes).

Quit mail, quit calendar.

Go back into Mail Accounts and turn back on Calendar.

Annoyingly, it will repopulate the calendar but also send you all of your calendar invites back to you, but otherwise it worked great to do this way and now it is synced.

This worked for me, I have 3 different mail accounts but only 1 was not working correctly with Sequoia since the update.

UPDATE: I now have about 98% of my functionality restored. I deleted all five of my synchronized calendar accounts and then added them back. Everything is now synchronizing as it should. I am also able to edit events but only if I double click the event to open the pop-up window and make my edits there. The missing 2% functionality is that I cannot edit events in the right side panel as before Sequoia. Also, no more freezes.

Following TKDKidd's advice, it worked for me but with a tweak: To get Calendar to work steady and stable I had to disable Scheduled Reminders from Calendar app on Mac (basically just disable it on the check box on the list of calendar - left menu), which is a pity because looks like a feature I would be pleased to use... I'll hold until Apple fixes this issue... If it will.

Note to whomever may want to try this solution. If your calendar is crashing then you have no way to get inside it to disable the Scheduled Reminders. You'll have to follow TKDKidd's steps: first go to settings and disable iCloud calendar sync, then open calendar (should work; in my case was displaying only the Scheduled Reminders), disable scheduled reminders (result empty calendar, or only non iCloud calendars showing), then on settings reenable iCloud calendar sync, may take a few mins to rebuild the events on the app, finally do not enable Scheduled Reminders (in my case, a few seconds after trying reenable, it crashes again, and I needed to go through these steps once again).

BTW, my scenario: I sync only my iCloud account related calendars (no gmail, no outlook, nothing else). I have several calendars under my iCloud account, some of which are shared with family members.

I also have several Reminders list, some of which also shared with family members.

Both in calendar and reminders I have a lot of recurrent items.

It looks like the root cause may be related with the volume of events to display on Calendar app when trying to combine all events and reminders on the screen.

Hope it helps someone else.

And thanks TKDKidd for the simple but effective tip.

End up having to remove all subscribed calendars. Tried adding one locally to my Mac via a new Calendar and the calendar started freezing and I would have to force quit out.

If you can't get Calendar to open try clearing out the `~/Library/Calendars/*` folder.

Would love to see this issue fixed so I can add my subscribed calendars back.

ok - I thought I replied to this with my fix but it didn't post so here goes again. Good news - when I updated to Sequoia 15.1 my calendar problems of the app locking up went away. I did have a problem downloading the update and it froze 10 minutes in about 4 or 5 times and I looked it up and they told me to reboot into safe mode and then try it and I did and it was able to download and update. This fixed my calendar issues. Yay! 😁

I have the same Problem! But his problem only occurred if I start calendar with iCloud access. Without iCloud access calendar runs stable. But it make not sense ...

I turned off the synchronization of my calendars in all my internet accounts and restarted the Calendar. Then I turned them back on. All seems fine now. Calendar does not crash anymore!

You are lucky! Just tried that. Crash city. Apple Help!

Were you able to reactivate the google calendar? I don't really use Icloud for calendars, only google since its linked to gmail. Most folks likely do this.

Same problem. After deleting the subscribed calendar with NFL matchups the Calendar App works properly.