I am just going to give you examples of what I think you want to do.
This just shows you a list of my calendars in my iCloud account. Note the "Hide" to the right of the "iCloud"? That only appears when you hover the mouse over it.

This shows what happens with you click on the "Hide".

Notice that I've unchecked "The Boys" calendar? That makes all of the events that are located under "The Boys" to disappear.

This just shows what happens with I re-check "The Boys", note "Joo's Medication" is now showing on June 1 at 12PM?

This just shows what happens when you click "Calendars" that is next to the "+" in the gray area.

So any of my examples what you are thinking of?
KOT