I recently ran into an issue where my CalDAV provider went down for a couple of hours so many synced events were displayed as duplicates in my macOS Calendar app. The CalDAV account was configured via a Profile so removing it meant I also needed to re-configure my mail account.
Reset Calendar.app
Fortunately there's a way to reset all synced events without loosing any preferences.
Quit the Calendar app
In Finder: Go to Users ▸ You Profile ▸ Library ▸ Calendars
If you don't see the Library folder, press CMD ⌘ + Shift ⇧ + . (Dot)
Delete the following files:
Calendar.sqlitedb
Calendar.sqlitedb-shm
Calendar.sqlitedb-wal
Now, re-open the Calendar app, press CMD ⌘ + R and wait for the calendars & events to re-sync cleanly. This can take a couple of minutes based on the size of your remote calendars.
If you're missing any items in the sidebar, go to Settings ▸ Accounts and toggle "Enable the account".
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