I remember signing up for ICAT once at the stadium before a game. They had a folding table set up. The line wasn't too terribly long, I don't think. It was on the east side of the stadium, which makes sense since that's where the student section is. Anyway, you just wrote your name on the list, paid your money, and they gave you the t-shirt right then and there. Maybe you also had to show your tickets. Not sure. What are everyone else's experiences with ICAT registration?