Masi79 wrote:Bucca is not a bad idea. Thanks! As for Royce I think I'd like to do something better than s burger place.
It sounds like you are misjudging Royce. It is not just "a burger place" like Five Guys etc. It is from John Des Rosiers, the chef at the upscale Inovasi in Lake Bluff, and occupies the space where his Italian restaurant, Moderno, was until recently. It's a very nice restaurant, not a chain. Now, it may not be the best choice for a group that large - it's tough to serve 50-65 burgers at the same time, and their other dinner items may be too pricy for you - but I wouldn't rule it out by pre-judging it as "just a burger place".
Also, it's going to be difficult to have a large dinner banquet
anywhere while spending only $20 per person, even assuming you do a cash bar so there's no alcohol. You might hit that price if you go to a pizza restaurant or maybe Chinese, but even a place like Buca di Beppo is probably going to be well over $30/pp (including tax/tip, non-alcoholic beverages, etc). Unless you're thinking in terms of a cocktail party, i.e. hors d'oeuvres only, rather than a full dinner.
Opentable has the ability to show and filter its restaurants that have private dining rooms/areas. Click here for a list of 22 restaurants in the north and northwest suburbs with private rooms/areas for 51-100 people: (website address deleted because it's apparently too long for posting here, sorry). Oops, that didn't work. Click
here and then use the filters on the left to narrow it down to north and northwest suburbs, and places that hold 51-100 people.