This is a request that I submitted circa 13 years ago!  Tasks should have calendars to take into consideration that some tasks can only happen on specific days, such as CAB meetings, for example.

I’ve worked around this limitation by assigning a user to a task and setting their working day to the CAB Meeting day.

Its not great and fails of someone removes the user from the task, so if someone has a working solution to this I’d also like to hear it!