It is not a mad house,and it is first come first serve.
Remember this is a 1000 seat theater, plenty of room. There is a cremember greeting you before you even enter the theater. She/he tells you to go in, and another crewmember directs you to a row of seats, you move all the way down and sit down. They are in walkie talkie communication with the tendering boat area, so when there is an available boat, your row stands up, and another crew member escorts/leads you to the tender boat. As usual, very organized, very calm!