A will call is a method of purchasing tickets. Instead of buying your tickets online or at a box office, you call the venue and tell them the event or show you would like to see and the number of tickets you need. The venue will then keep your tickets at their "will call" counter or box office so you can pick them up when you arrive. This way, you don't have to mail the tickets or have them delivered. It is also convenient if you buy tickets last minute or don't want to wait for regular mail or delivery.