See if Rue 57 at the corner of 57th & 6th is open. Also check Molyvos (Greek) 7th & 55th; and Redeye Grill 7th & 56th; and Trattoria del Arte 7th bet 56 & 57. I don't know which are open, but any should do and have enough space to fit you depending upon how large "large" is. I'm working on the assumption of not more than 10 or 12. There's also Petrossian on 7th & 58th.