Play 4 or 5 different board games for a set amount of time each. Win points based on where you finish.
Several board games.
Have 15 to 25 people attend and participate in the various board games. Usually about 4 or 5 different games. See a list of ideas below. Have a group of 4 or 5 sit at each table and play. Set a time for 20 minutes. After the time goes off have each table figure out who is winning and who is losing. You get points based on where you finish, i.e. 4 points for 1st, 3 points for 2nd, etc.... At the end, once everyone has had a chance to play each game, a king, or a queen is announced. Take pictures and the passing of the crown! It's absolutely a blast! I highly recommend this type of event for someone looking for something out of the ordinary. Make sure each table has different people for each game so that it gets mixed up.
Here are some good games for a tournament:
Chutes and ladders