Here are some notes from Bob about the Autocross event.
"What they [the SCCA] are most concerned about is preventing cars from collision with stationary objects.
We will maintain the legal distance of 20 ft. from such objects. You will basically run at about 20- 25 mph around cones.
Only one car will be on the short parking lot slalom - type course at a time.
Hope this helps!
Bob"
Here's a repost of the link I gave earlier, with an article with some information on Autocross:
SCCA article: Road Racing vs Autocrossing
You need to get down to the section headed "Autocrossing".