Anyone interested in participating in a track day in the Chicago area can check out Leon does a good job organizing these events. Several of us "BMW Types" did this last season. The sessions were professionally run and reasonably priced. Blackhawk Farms is north of Rockford, IL and Autobahn is a new facility near the NASCAR track in Joliet. The schedule:
May 25 Blackhawk
June 23 Autobahn
July 2-3 Weekend at Blackhawk
July 27 Blackhawk
September 8th Autobahn

June 8 True Novice track day Blackhawk (Tentative)
August 31 True Novice track day Blackhawk

Also, Keith Code has a session scheduled at Autobahn around the first of August.