Fleece Festival at the Prospect Park Zoo is pretty much what you’d expect. Take the kids to see the sheep and alpacas get their annual haircuts, and meet local artists who will demonstrate weaving, knitting, and spinning techniques. Musical guests will also perform. Event is both Saturday and Sunday.

Family Day: Phenomenal Festival of Flags! at BRIC Rotunda Gallery is tomorrow, 21 May, at noon (33 Clinton St. between Cadman Plaza W and Pierrepont St). Kids and their adults can make their own flags.

Meet the Authors: Diane Kredensor and Thomas F. Yezerski at DUMBO’s Powerhouse Arena (37 Main St.). Emmy Award–winning children’s television director and animator Diane Kredensor reads from her new book Ollie and Moon, then Thomas F. Yezerski talks about the recovery of New Jersey’s wetlands from his book Meadowlands. Begins at 4pm.

Sunday at 11am, head to BookCourt (163 Court St.) for a reading by Laura Lee Gulledge from her tween book Page by Paige, about a girl having trouble adjusting to the big city. Kids 10 and up can stay after for a quick course on how to write a graphic novel.

Don’t forget that Food Truck Rally at Prospect Park’s Grand Army Plaza. Goes from 11am to 5pm on Sunday, 22 May.

Come to Carroll Park Saturday at 11am to celebrate It’s My Park Day. Spend an hour or two weeding, painting, planting, and cleaning–then come in for refreshments at 3pm in the Robert Acito park house. Activities include sessions in seed planting @11am, long jumping @noon, drawing and painting plants @1pm, mystery mural @2pm, and a roving game of I-Spy @2:40pm.