Hi L.,
Please check out my website, www.kidwinks.com - it's The site to know with kids in tow. There, you can find kid-friendly events, activities, restaurants (there's even a Kids Eat Free calendar in the Restaurant section where you can find out where kids eat free), shops and services throughout the Chicago area and suburbs.
In the Services section you can look through the camps listed; I don't know if any are by the week. But if you become a member of kidwinks, which is free, you can sort the camps in order of distance from your house. Same with activities and events.
You can read parents' reviews of places they've visited and write your own (if you become a member, which is free). Check the box to join our mailing list, and we'll do the work for you on finding fun things to do - we'll email to you weekly links to upcoming fun, family-friendly events. We've received tremendous positive response to our emails - moms love them!
Hope this helps. Good luck!
J.