Dante and Luigi's
I would consider Tre Scalini, which has much better food. However, it's BYOB and there are steps to the upstairs, where they seat large parties.
I have been to a large party at Branzino, another excellent BYOB in center city.
Do you need a place with a bar? Most Italian restaurants have many choices, including fish and pasta - plenty safe.
If you're looking for safe... this it it.
It's okay. I have been there twice--the last time within the last six months.
The food is just okay and almost not good enough for the rather high prices that they charge. Honestly, I think it lives off of its name and lore as an old-fashioned Italian restaurant in Philadelphia. Since you're bringing 30 though, the place strikes me as a good large group place--it's spacious and has large, long tables. They have enormous meat balls. That probably didn't need to be said so frankly...
There are certainly better Italian restaurants out there--the one that comes to mind at the moment is Osteria but it may be very difficult to get a reservation for 30 any time soon there.