Greenmarket in Windsor Terrace, from 8:00 a.m. to 3:00 p.m., at Prospect Park West and 15th Street, rain or shine. See http://karmabrooklyn.blogspot.com/2011/04/windsor-terrace-greenmarket-reopens.html for more information.
Singalong with Debbie Deane, from 10:00 a.m. to 11:00 a.m., at the flagpole in Greenwood Playground, E. 5th Street by Greenwood Avenue. For ages 0+. Free.
Movie: "The Counterfeiters," from 1:00 p.m. to 3:00 p.m., at Windsor Terrace Library, 160 E. 5th Street, corner of Fort Hamilton Parkway. Free. (Germany, 2007; in German, with English subtitles.)