Sen. Charles Schumer had to move his annual Schumerland holiday party from New York to Washington when he got stuck in Senate hearings on the tax bill this week. Schumer throws his annual bash for friends and former colleagues, dating back to his days as an assemblyman. This year’s will be held tonight at Sidecar at P.J. Clarke’s in DC. “It’s disappointing,” said one regular Schumerland guest who can’t make the trip. “Watching Chuck get down on the dance floor is always a year-end highlight. Chuck has perfected the chicken dance.”