There seems to be an autocross event this Sunday at Washington Redskins Fedex Field about 30 minutes from my home. But I can find very little information about it. It just says "test event at Fedex Field (AX)". Any idea what that means? At what time would it be? The event is held by Washington area SCCA.

Also, on the topic of helmets, are they one-size-fits-all or do you have to know your size? Would it be OK to buy one in a motorcycle store?
Thanks a lot