There have to be, like, 5+ events every single weekend in SoCal. Use WD40's link or Google "California SCCA" or "Autocross" or "SOLO" and I'm sure you'll find a ton. Even if you just go to your local SCCA sites, they'd likely have a ton more links.
Don't waste another minute waiting on parts, or anything else. Just get out there and start racing! You will suck at first, and you will be slower than many other cars, but the only thing you will regret is not starting earlier...