Madison is a Speedway.. oval track and a drag strip.
As far as Madison, IL itself... that's nowhere I would drive my G-body, much less park it over night, unless there was an Event with Security.
You would be better off staying in Fairview Heights, Collinsville, Glen Carbon, or Edwardsville.
If you see a sign that says "Welcome to East St. Louis" lock em up, put that b*tch in reverse and GTF outa there.
See Attached. (Any locals? Feel free to disagree with me, but I'd doubt you will)
Anywhere between the Mississippi River and the Red Line, isn't a place I take my car unless Im on the highway headed to STL.. which would be odd, because STL isn't much better. I think my car has been in Missouri Twice, Maybe three times... and just passing thru at highway speeds... lol
(The Red Dot is the Venue - I live just off that map in the bottom right area)