Pick a day before Halloween
Get a really big Turkey donated
Have each homeroom select a racer
Get 3 tricycles (one for back up)
Balloons, pylons and streams for real amusement also cool
Run a series of races in tournament style through your school hallways (make us of the wheelchair ramp) Right after the ramp you have to stop and sit on a balloon and you have to sit on another at the finish line. Gets everyone cheering.
Our last one was pretty disorganized. Just to give you a few hints, next year we're going to use walkie-talkies to communicate between start and finish and have an informative meeting with all racers before the race. :)