This should be a link to the event and build rules.
(PDF file 3 or 4 MB or so)
RULES
Basically, budget of under $500 per car. 12 or 24V systems only. Can't build 'em too big (tall is ok.) Power must pass through Powerwheels wheels and hubs.
We also used our industrial espionage techniques to find out that, potentially, the events may include:
Drag Race
Road Course
Oval
Off Road Rally
Relay Race
Night Race (Tokyo Drift)
Soccer Match
24 Hours of Fischer Price (Endurance Race)