Unable to delete calendar invites on my Calendar App after macOS Sequoia update

Thank you so much! My problem was with an external appointment scheduling app (it was switching the label of the event to canceled, but I couldn't delete it). Toggling the calendar on and off successfully removed all the canceled appointments.

This is such a silly problem to exist, but for me the 2 main posted solutions worked.

1) can disable and re-enable the calendar account after "fixing" any invites via outlook on the web or wherever else outside of calendar. this clears the old junk but as others have said, more invites to mailing lists & other weird addresses will cause new issues down the road.

2) using the "void" calendar works great. Any of the read only calendar events I move to that void calendar, then I can delete if I want, or just keep it hidden and remove alerts.

On another note I was an old Mac user that recently switched back, I used my iPhone as the main tool for years along with windows Microsoft outlook. I'm finding it very hard to keep things organized as far as consolidated calendar, mail, etc. I have office for Mac and Microsoft 365 but am trying hard to not use them - I should be able to use Mac calendar, mail, etc for everything all in one place. But this Microsoft & apple collab needs some help still, from both sides it seems.

Anyway, thanks to the posters who suggested these solutions.

I've added my work group mail to my addresses in Contacts and then I was able to decline/accept the events that were previously read-only!! No more unwanted events in my calendar!

Thanks for the tip!

Deleting the account in Internet Accounts, rebooting and re-creating it resolved the problem for me.

This works!! I love you!

Agreed.

Agreed. Still the same 4 months later. I tried adding an email address to the contact card, but that does NOT work.

I have this problem. I have removed and re-added the account. But It dont seam to help. Other calendars google and iCloud works fine