I do know that the Aqua & Ice show have areas reserved for Suites, P, D+ & Key. However, one needs reservations. My understanding is that Royal maintains 25% available for on board reservations. Usually there's staff in Boleros for reservations.
As an instance, on Oasis all of the adult comedy shows were sold out. One night we went to the standby line. Before they opened the door, there were twice as many in the standby line as there were in the reservation line. Everyone got it in. The Blaze room is oddly configured with a bar in the middle of room.