That kinda sounds like the group I had for my rehearsal in the same neighborhood. I went to Nodding Heads (which is now defunct), but I would lead you in the direction of a restaurant/bar. Speak to a manager, and they should be able to carve space out for you pretty easily or give you a private room, pending on the day and time you are looking. McGillan's Old Ale House has an upstairs that would fit well. Smoking Betty's is a nice spot, have had work-office lunch events there, a retirement party (up stairs). On the more casual-scale, the Field House has both an adjacent side room, and an upstairs area for a party of that size. Given the address of 12th & Market, you're likely at either the Marriott or the Loews, both of which could accommodate. A bit further walk down 12th (Pine) is Mixto, a very fun restaurant with an upstairs that could be group reserved. For a good meal, some space between your party and everyone else, and very local to 12th & Market, these are decent rec's. Would probably list in my personal desire as McGillan's, Mixto, Smoking Betty's, Field House (location/space, not cuisine). If you are a bit more adventurous, there are plenty of options in Chinatown as well. However, I'm unfamiliar with those venues to recommend.