Friday nite you can head north and east to Orlando Speedworld which is on Route 50 (E. Colonial Drive) to watch the PRI-sprint and midget racing and drifting if you want to smell burning gas and rubber.
There is a Saturday nite cruise in Old Towne which is in Kissimmee directly south of the Convention Center, just follow International Drive. If you go north up International Drive, a cool place to eat is the Race Rock cafe.
-Bruce