Also - if it isn't too late to register, there is a "big track" AX up at Streets of Willow on Monday (Sept 17). This is a VERY fun event for high-speed Autocrossing.
See their web site at
http://www.pcaocr.org and check the Events calendar for Monday. Also, double-check any safety requirements - cabs without integral roll protection may not be allowed, and there may be some other restrictions.
Unfortunately, my new job precludes my getting up there this weekend/Monday

, but it was a great time last time.
Also, GPX Region is doing their "Day Away from Work" AX up at Streets on October 8th (Monday). See
http://gpx.pca.org