Weekend Fare - NYTimes.com A combination night market, food festival and concert series, the Brooklyn Night Bazaar, returns tonight in a warehouse at 45 North Fifth Street (Kent Avenue), in Williamsburg, Brooklyn. It will be open every Friday and Saturday from 6 p.m. to midnight through Dec. 22. Admission is free. The Brooklyn Flea moves indoors for the season starting this weekend, once again operating out of Skylight One Hanson, 1 Hanson Place, in Fort Greene, Brooklyn. Besides the usual array of vendors, a holiday gift market will be open from 10 a.m. to 6 p.m. for the next five weekends leading up to Christmas. The chef Sara Jenkins leads a cooking demo for children on Saturday at 2 p.m. at the Children's Museum of Manhattan, 212 West 83rd Street (between Broadway and Amsterdam Avenue), on the Upper West Side. The class, which is for children 5 years old and above, is part of a series of cooking demonstrations by chefs about healthy food organized by the museum and the James Beard Foundation. The price of admission includes entrance to the demonstration.