Good news for you - startup weekend has an event near you in April. BTW, I'm not affiliated with them, but have participated in one in SoCal and find it tremendously valuable.

http://beta.startupweekend.org/about/events/

You really should share more about your concept if you want maximum exposure. From the sounds of it, you are focusing on a niche of something like what came out of startup weekend LA three weeks ago, got a million in funding already and is at SXSW killing it as I write this message! ;-) Check front page of techcrunch for Zaarly. I missed that boat!

Also, you made another comment about "not being able to find these meetups... Google is pretty incredible resource! But for starters, maybe go to meetup.com or search for local hacker groups around Chicago, IL.