Volunteers receive free pizza from the traditional or below ranges on the night (most attendees will only get to choose from a very limited range and also have to pay $5).
Note: For those considering volunteering to supervise a tournament, all you have to do is oversee the matches, and update the tournament brackets accordingly. Not a hard job! You can even compete if you like!
(Rigging the tournament is 100% not advisable because the other competitors will rally against you. There will be torches and pitchforks.)