I updated my iMac to Ventura 13.4, after which my calendar is completely screwed up. Every day looks more or less like the screen shot I included here. It has taken an entry from another day and duplicated it many times over for today's date. This same thing is repeated for every day, every week. The calendar is unusable. I restarted again but that didn't change anything. What do I do now?
iMac (M1, 2021)
I think I fixed it. I was afraid the crazy calendar would mess up my phone and other device calendars, so I switched
iCloud sync off for the calendar. Apple menu/system settings/Apple ID/iCloud/apps using iCloud/switch Calendar sync OFF. The duplicate entries on my Mac calendar were now gone, along with everything else except default holidays and such. But the calendar looked normal, if empty. So, I switched iCloud sync back on and the calendar repopulated my items in the normal fashion. It looks fine now. Whew!
Mac Calendar filled with duplicate entries after update to Ventura 13.4
