Can't delete event from my calendar

Hey i1911,

We'd suggest trying the steps from this article: Add, modify, or delete events in Calendar on Mac - Apple Support

"Delete an event

In the Calendar app  on your Mac, do one of the following:

• Select the event, then press the Delete key.
• If you receive a calendar event from an unknown sender, you can report it as junk and delete it without notifying the sender. Double-click the event, click Report Junk, then click Delete and Report Junk."

You may also want to check to see if the event is synced with iCloud and delete it from there. This article explains how: Delete or hide a calendar event on iCloud.com - Apple Support

Thanks!

Thanks for confirming that for us.

We'd suggest getting in touch with Apple Support directly next. They'll be best equipped to further assist, with access to additional tools and resources. You can reach out to them at your convenience here: Get Support

Have a great day.

Hey there i1911,

This does seem to be unexpected behavior, as you mentioned it does act as if it deletes the event, but then returns shortly later. That being the case, we'd like to rule out some possible causes by confirming the following:

1. We see you have macOS 12.5 installed, but the latest version is iOS 12.5.1. You can verify this by clicking on the Apple logo at the top left corner of the screen, then on ‘About This Mac’. This link will show how to first back up, then Update macOS on Mac.
2. If you already have macOS 12.5.1, have you already tried a restart of your Mac? If not, check out the section 'Restart' here: Log out, sleep, wake, restart, or shut down your Mac
3. If you test making a new event in Calendar, then delete it, does the same issue occur?

Cheers!