“Zucker punch” was an in-demand cocktail at the “Today” show holiday party at The Lighthouse at Chelsea Piers. In addition to celebrating 15 years as the No. 1 morning program, the soiree was an unofficial send-off for former NBC President Jeff Zucker. A surprise performance by James Blunt was capped off with holiday drinks named after staff, including JIM BELLinis, LAUER Sours and Bloody Merry VIEIRAs. The anchors, including Matt Lauer and Meredith Vieira, and the staff — who get up for work at about 3 a.m. — hit the dance floor at 11:30 a.m. after their shift ended. They finally called it a “night” at 3 p.m.