D.S.
Hi H.! Wow! That is a BIG birthday party :) I am not sure how these places charge or what the guest limit is, but you may have to pay per head. Here are a few places in Chicago that my daughter (who just turned two) loves:
Fantasy Kingdom:
A large party facility and play space with dress up, etc. with a cake/food room.
1422 N. Kingsbury Street
Chicago, IL 60622
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Pump It Up, Jr.:
An inflatable party zone to climb, bounce and play with a cake/food room.
821 W. Eastman
Chicago, IL 60622
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Bubbles Academy:
An 8,000 sq ft facility with an all-inclusive birthday party package...each party is led by a teacher trained in performing arts with fun things to do for the kids.
1504 N. Fremont
Chicago, IL 60622
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Good luck and Happy Birthday to your little one!!