Could sell two classes of tickets, one that is garunteed and one that might be overbooked. If you show up and find out you're overbooked you get a credit for a

Could sell two classes of tickets, one that is garunteed and one that might be overbooked. If you show up and find out you're overbooked you get a credit for another show (maybe even at some multiplier?). Basic Supply/Demand suggests that reducing the price means more demand, ie: more people going to go see shows, but would need to see it in practice to know for sure.