Also if you plan to buy a helmet...be sure that you get one that is Snell approved>That way if you ever decide to auto-x your car, you'll have a legal helmet.
FWIW: I know it won't do you much good for this event but
http://www.denniskirk.com/jsp/produc...eafCatId=40103 has some good deals on Snell approved helmets. $49 + $6 shipping= $55