11 am: Movie: “The Wild Thornberrys.” Brooklyn Public Library Central branch (Flatbush Avenue at Eastern Parkway in Grand Army Plaza). Free. Call (718) 230-2100 for info.
1 pm: Crafts class. Prospect Park Audubon Center, enter park at Lincoln Road and Ocean Avenue. Free. Call (718) 287-3400 for info.
2 pm: Kids’ sing-along. Brooklyn Public Library Central branch (Flatbush Avenue at Eastern Parkway in Grand Army Plaza). Free. Call (718) 230-2100 for info.
1 pm: Earth Day Celebration. Pacific Street Bear Community Garden (Flatbush Avenue and Pacific Street in Park Slope) Free. Call (718) 783-1685 for info.
3:30 pm: “El Dia de los Libros.” Brooklyn Public Library Carroll Gardens branch (396 Clinton St., at Sackett Street in Carroll Gardens). Free. Call (718) 596-6972 for info.
4 pm: Teen poetry workshop. Brooklyn Public Library Flatbush branch (22 Linden Blvd., at Flatbush Avenue in Flatbush). Free. Call (718) 856-0813 for info.
10 am-3 pm: Baltic Street carnival (between Court and Clinton streets in Cobble Hill). $20 for an all-day pass, or pay as you go. Call (718) 237-1862 for info.
10 am-1 pm: Bike-riding class. McCarren Park (Bedford Avenue and North 12th Street in Williamsburg). Free. Call (212) 932-BIKE for info.
11 am-4 pm: Animal haircuts and kids’ art projects. Prospect Park Zoo (enter on Flatbush Avenue just north of Empire Boulevard). $8, $4 seniors, $3 kids. Call (718) 399-7339 for info.
11 am-4 pm: Animal haircuts and kids’ art projects. See Saturday, May 3.
2 pm: Concert: Princess Katie and Racer Steve. Southpaw (125 Fifth Ave., between Sterling and St. Johns places). $10. Call (718) 230-0236 or visit www.spsounds.com for info and tickets.