OLD CITY – Dining out is apparently a thing on Christmas Eve. It is a big night for many restaurants, like Parc, in Rittenhouse. “We have some oysters, some beer, some lovely baguettes and have a nice time,” said Jim Naughton. He, his wife Cynthia, and their daughters were out Tuesday night and say coming to Parc is what they have been doing every year on Christmas Eve for the past 20 years.