Feature Request: Restrict Bookings by Tag

It would be great if individual calendars could be configured to be restricted to users that DO or DO NOT have a particular tag or combination of tags.

My desired use case: I have a site with a cooking class available each month. Ideally, users who have already booked a cooking class for one month should not be able to book the same class in another month. If a user had a tag of "Booked" Cooking Class: June", I could then prevent that user from being able to book another cooking class in an upcoming month.

I could see it being beneficial for other use cases as well, such as calendars that are visible to free members but only paying members should be able to actually complete a booking (because of the existing tags indicating a user is on a free or paid tier of membership). Sure, you could only publish calendars that are specific to paid or non-paid members. I won't argue that. Just another potential use case.

Would anyone else benefit from such a feature?