Because both events are by the same promoter I am taking the liberty to post info about both shows in this single post.
CHEVY/VETTEFEST:
Dates are November 20 and 21, 2004 and March 12 & 13, 2005.
Both the dates are at the McCormick Place, Chicago.
SUPER SUNDAY INDY:
Dates are October 24, 2004 and November 28, 2004
Both dates are at the Indiana State Fairgrounds in Indianapolis.
I have attended the Chevy/Vettefest, there were some very good deals at the swap meet, and many vendors were offering perks like free shipping, or a show discount. I have not had the opportunity to attend the Indy show, but I've heard the swap meet is very good there as well. More information on both shows is available here:
http://www.midamericapromotions.com/DEFAULT.HTM