Google Calendar only partially syncs with Mac Calendar

Hey everyone,

I have a problem with Google Calendar on my MacBook. I've added the account and Mail sync works fine. But on the Calendar App only about half of my events are synced (Error message: your calendar couldn't be refreshed. There was an unexpected error with the account "google"). I've tried readding the account, using app specific passwords (as I use 2FA and cannot access the "less secure apps" settings, what seams to have solved this problem for some), tried rebooting, basically everything I could find Online. My MacOS ist up to date and using Google Calendar with my iPhone works like a breeze.

Does anyone have an idea?

Thank you!