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Bloomingdale’s fans gathered at Beacon Court this evening for the performance of iLuminate, an “America’s Got Talent” act of dancers who wear “Power Ranger”-ish suits that light up as they move to a blend of hip hop and electronic music. Then came Idina Menzel, the Tony award-winning actress/singer, wearing a black fur jacket. She sang “Have a Holly Jolly Christmas” and a few more Christmas standards before performing her hit, the theme song from the movie “Frozen.”

“I have a show to do over there on 46th Street. Are you coming? I’m not going to have a voice left, so I hope you’re not coming. Screw those people at the Richard Rogers,” she said, referring to the theater where she’s performing “If/Then.” “This is what matters.”

Later, Menzel said before performing her final song, “Silent Night,” “If you’re afraid to be alone on the holiday, you know I sometimes do, snuggle up with someone — or if you prefer to be alone, there’s nothing wrong with that is there?”

Bloomingdale’s windows are highly interactive. One window uploads images from a shopper’s iPhone. Another features a giant teddy bear covered with hundreds of gold bows. The message is to do good by buying the limited edition Gund bear benefitting the Child Mind Institute.

In another window, shoppers are told about a game called Memor-A-Bow, a slot machine style game at Food trucks were parked along Lexington Avenue handing out cookies and cups of hot chocolate, but given the unseasonably warm weather, people might have wished it were iced hot chocolate.