[Taylor]

Check with your school and the law. Back a hundred years ago when I was working in radio, we had to be very careful with our contests - the raffle/lottery/gambling laws are very precise and troublesome. If people win or lose money, you've most likely got a problem. However, if people pay an entry fee, "gamble" with meaningless tokens, and could win nonmonetary prizes, you may be okay, with proper precautions.