The Super Mileage Challenge is an event for High School kids sponsored by the Indiana Mathmatics, Science, and Technology Education Alliance (whew, that's a mouthful).
IMSTEA
The company I work for is supporting our local High School team, and there's a small, outside chance that I might get to go. I don't know how spectator-friendly the event is, as I have never been to one. O'Reilly Raceway Park is a nice facility, though.