Events
A room for forty never sells fifty.
A session stops being bookable the moment its room is full, at the point somebody tries to take the last place rather than in a report the next morning. When a place is given back, the next person waiting is let in without anybody watching for it. Your on-site team stops having to decide who gets the seat.
Stop a session selling past its room
A limit on a session is enforced when someone registers, not discovered on the morning.
Move a waitlist without running it by hand
When somebody drops, the next person is offered the place. Nobody works through a list the week before.