Joey McIntyre will help usher in the city’s official Christmas tree on Dec. 1.

McIntyre will perform during the pre-lighting ceremony on the Common at 7 p.m. before the tree – an annual gift from Nova Scotia – is switched on. Other performers include American Idol finalist Siobhan Magnus, the Radio City Rockettes, Rockapella, the Boston Ballet, the Boston Children’s Choir and saxophonist Grace Kelly.

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