it is a bunch of weekenders who get together in parking lots and race. Courses are set up with cones in parking lots and you race against the clock. The are like time trials on coned courses in huge parking lots. The are several clubs in virginia that run autocrosses.

www.vmsc.org
www.tidewatersportscarclub.com
www.odr-scca.org

The SCCA runs autocrosses nationally. Solo 2 is another name for autocross. go to www.scca.org

This page will tell you about autocross, too: http://www.vmsc.org/autox101.html

hope this helps.