CHRIS NOTH can't stop performing after the curtain falls. Following last Wednesday's preview performance of "That Championship Season," the actor formerly known as Mr. Big invited his castmates for an impromptu dinner party at Da Marino restaurant. The crew and close friends, including PR man Laurance Gay, joined Noth, Jason Patric, Brian Cox and Jim Gaffigan for calamari and fresh mozzarella, plus a little bonding before Sunday's opening night. The show's fifth man, Kiefer Sutherland, couldn't make it, but that didn't dampen the team spirit: the four co-stars sang a hearty rendition of the high school fight song they perform in the show and then - after a standing ovation from their fellow diners - Gaffigan and Noth did a dance number. Gaffigan told the crowd that if ham were a person, it would be Noth. Yum?