Came here to request the same! Or for instance I have a calendar with closing and payment dates for credit cards but I don’t need my month to look “busy” for these routine passive events!

This!!! I like that birthdays are mentioned but i dont think it should be included in the heat map. It makes my calendar look a lot busier than it really is. Would be great if i can toggle to the “birthday calendar”, release it, have the birthday calendar remain so i wouldnt have to hold the calendar with my thumb and use another index finger to click on the dates.