Schedule classes only if >0 people book - using 1 calendar

I currently have the basic plan which offers 1 calendar. I would like to keep it that way if possible, but if there's no workaround I might consider upgrading.

I'm trying to offer workshops open to up to multiple people as frequently as possible (morning and afternoon every day), however, I have several other services (private appointments) that I'd like the user to be able to choose their preferred time on the calendar. These private appointments, if booked, should take precedence over a class with 0 bookings, effectively making it no longer available.

Is there a way I can implement this in Scheduling?
Currently, my classes (even when no one is signed up) prevent my private appointments from being booked.

Thanks!