I am taking 8th graders on a field trip to the National Constitution Center on Arch Street in Philadelphia. We are going to have lunch after our visit there but want to do it on our way back home to Allentown. I don't want to stop too far out of Philadelphia or else it will get too late. I need someplace that will accommodate approximately 50 people, so it would probably have to be a chain restaurant. Looking for some place less than a half hour from the National Constitution Center. I know there are tons in center city Philly, but they are small and not likely to accommodate our group size!