Looks like the closest SCCA autocross is Fontana https://www.solo2.com/events
Its pretty cool they have a Sat for just practice as well as the event on Sunday.
If you have time, maybe go over on Sunday and see what's involved. Usually there's no charge to just watch as these are 'non-spectator events'. Just sign the waivers. You can then walk the course, watch the runs, and depending on local rules - maybe observe from a pasenger seat.
For some reason Cal Club has seperate websites for the autocross, road rally, and road racing.