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Sibyl McCormac Groff, who leads idiosyncratic Christmas tours in and around Rockefeller Center, holds a balloon and watches a Christmas tree during a tour in New York, Dec. 10, 2017. Groff is a self-directed tour guide of a holiday experience she calls Gothamtide. (Jeenah Moon/The New York Times).

Sibyl McCormac Groff, who leads idiosyncratic Christmas tours in and around Rockefeller Center, holds a balloon and watches a Christmas tree during a tour in New York, Dec. 10, 2017. Groff is a self-directed tour guide of a holiday experience she calls Gothamtide. (Jeenah Moon/The New York Times).