PCA (Orange Coast and Riverside chapters) will be holding a autocross event June 11 from 7pm to 1am in San Bernardino.
http://www.pca.org/zone8/
Goto the calendar page, click on the June 11 date and the reg form (pdf) will come up with all the info.
If you Pre-Reg its $40. Not bad to give your Boxster a safe track experience.
KRZ