You guys do know I was recruiting for AutoCross at the Stadium? If you guys hold a meet there that is fine but the stadium usually charges a dollar for access. Most people just hold meets at the Starbucks/McDonald's located across the street.
The Auto Cross event is held in the the fenced in area where the Fair was at. If you do auto-x you can either purchase a yearly membership ($ depends on age/military affiliation) or weekend temp ($25). Helmets are available but most people bring their own, if you don't have one I'd suggest a bandanna to put on your head (sweat). Also, closed toe shoes are required.
I probably left out a ton of info so here is the link:
Welcome to SCCA Hawaii Region Web then click on solo.