The PPSCC (Pikes Peak Sports Car Club) is running an autocross on May 20th in Castle Rock. These events are usually low key compared to scca events and you get a ton of runs. Its a great way to try out autocross before going to a scca event, which usually has 120+ people compared to where ppscc which usually has about 60 people.

Here is a link to website with more details
http://www.ppscc.net/smf/index.php?topic=1014.0