Sorry, this is one of those cases for me that a 30 second conversation would have been faster and avoided confusion lol. I think I understand what you are saying now. Have a separate card for each calendar and one for all events per day and let the native visibility options handle which ones show. Yes it’s repeated config, but I’m fine with that.
This is just effectively a filter and since I have a finite set of cases (calendars), the above approach should work fine.