I don't know about a free lunch, but I am going to try and sneak a few HuntingNet hats and doohickeys to pass out down there.
I'm going to be there for sure on Saturday (barring floods, alien abductions, locusts and whatnot).
The Illinois State Bowfishers will be meeting up in the afternoon/early evening and having a meeting over some pizza. If you're interested in bowfishing, join us.
http://www.illinoisstatebowfishers.com