If you want to race, Championship Cup Series (CCS) is the main organization in the area. They just had their last race at Gingerman this past weekend. There are different regions, but they race Road America, Blackhawk Farms, Gingerman, Mid America, Gateway Interational Raceway, and others. They have a race licensing class normally on the first day of the race weekend - Saturdays. Give you the basic rules, one or two sessions and a mock race.
A lot of people do track days to get up to speed. Track days aren't races. They split usually into different groups based on ability and experience, ie. Novice, Intermediate, and Advanced. Each organization has different rules on how you get to the different groups. Each organization has different rules on equipment, gear, and bike preparation.
There is also some racing at Brainerd in Minnesota. CRA?
Some local and not too distant tracks :
- Blackhawk Farms (just in Illinois)
- Autobahn Country Club (open next season near Chicago)
- Gingerman (South Haven, MI)
- Grattan (Belding MI)
- Putnam Park (near Indianapolis)
- Mid Ohio
- Mid America (near Omaha)
I'm sure if you search on track day organizations you'll find a bunch of groups, then check their schedules, requirements, etc.