If you crave something sweet this evening, head down to the Brattle Theatre for their Sugar & Cinema extravaganza. The festivities, which center around champagne and fattening treats, commence at 8 p.m.; Joanne Chang will be there to hand out sweets from Flour Bakery and Cafe. And if you’re looking for a gift for that sugar-hound on your list, pick up a copy of her new cookbook, Flour: Spectacular Recipes from Boston’s Flour Bakery + Café. Then relax for the cinema portion of the evening: Chris Hegedus and D.A. Pennebaker’s new movie, Kings of Pastry, which documents the French pastry competition Meilleur Ouvrier de France.