How to identify which gmail account my MacOS calendar entry comes from

I have multiple gmail accounts. I have "linked" them to my MacOs calendar in order to see all calendar entries in one place. Unfortunately most calendars have the usual holiday entries. So I have multiple holiday entries in my MacOS calendar that crowd-out meaningful entries for that day. BTW these holiday entries in gmail come by default and cannot be deleted.

So my question (whew!). How do I either manually delete some entries from my MacOS (I guess since the source has it I cannot). or select the type of entries from these calendars I want to reflect in MacOS calendar.