I always call the AD as well. With the advent of so many of the electronic assigning systems it's less likely that this will be a problem as the years go by. A few years ago I got a call on Monday morning at 8AM from the athletic secretary checking. They got stiffed for no refs the previous Friday and were checking really early for the next Friday. Another time, I dutifully called the school and got information on time of game, who was coming, and everything but failed to ask if they played the game at the school. Turned out they didn't and we had to scramble to find the other site. I no longer forget to ask that question