Magic for an "Event"

I've got a problem, let me give you some context. November 9th is the presentation for my basketball club, and the organizers asked me if I'd be up for doing some magic – basically, drawing a crowd and performing. The issue is, I have no idea what tricks I can do. Between players and parents, we're talking about 400 people, so I'm really stuck on what to perform.

I really want to do this, because as a magician, it's a huge step to perform for so many people. But my problem is I just don't know what to do. Plus, it's in an arena, so I can't really set up for a full-blown show. It'd have to be card tricks or something simple.

If anyone knows of any gimmicks, courses, tricks, or anything like that, please let me know! I'm even open to paid resources.