ppezalla, the animal you are hunting, unfortunately, does not exist. Northerly Island is on the lakefront directly east of the Loop and downtown. There is nothing that even approaches a real ‘Que joint anywhere near that area. The closest places that serve decent barbecue are either on the south side or near-north side. Of those, I don’t know of any that will accommodate a group of the size you’ve described. If you can arrange for a hall, I would highly recommend catering from Country Smoke House (773)327-0600. Other good options for this scenario would be LT’s Grill, Leon’s, or Fat Willy’s Rib Shack. Wish I could be of more help. There must be others out there with an opinion.