Military membership is $30 ( I think) and civilians are $70. I would sign up online or give them a call.
SCCA Sports Car Club of America is the national website where you can become a member. Hawaii is the local region.
Below are the dates which are all on a Sunday.
09/27/09 10/4/09 10/18/09 (Test & Tune)
11/1/09 12/13/09 1/10/10
1/24/10 (tentative T&T) 2/21/10 3/7/10
4/4/10