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Friday, July 25: “Anatomy of a Powerhouse: Electrifying the El”

“Anatomy of a Powerhouse: Electrifying the El”: Archival photo exhibition showing construction and early operation of the 74th Street Powerhouse. $7 ($5 for children 2–17 and seniors, free for members and children under 2). 10 am–4 pm. New York Transit Museum, Boerum Place at Schermerhorn Street, (718) 694-1600, www.mta.info/mta/museum

Friday, July 25: Play Streets

Play Streets: The Police Athletic League is providing a safe environment for children to play in. Free. 9 am – 5 pm. Surfside Houses, @@2839 W. 33rd St.@@, , Http://www.palnyc.org

Friday, July 25: Volleyball Clinics

Volleyball Clinics: Children sharpen their skills with spiking, serving, and saving. Experts at Metro Beach Sports start with the fundamentals all the way up to expert. Free. 10 am – noon. Pier 6 Brooklyn Bridge Park, @@Furman St. and Columbia Street@@,

Thursday, July 24: Syfy Movies With a View: “Fantastic Mr. Fox”

Syfy Movies With a View: “Fantastic Mr. Fox”: Roald Dahl classic hits the big screen in Wes Anderson’s quirky, stop-motion animated film. Free. 9 pm. Brooklyn Bridge Park, Harborview Lawn, @@Enter at Old Fulton St. near Furman Street@@, , www.brooklynbridgepark.org

Thursday, July 24: Art Off the Wall: According to What?

Art Off the Wall: According to What?: An evening of performances and interactives inspired by the work of Ai Weiwei. $18. 6:30–9:30 pm. Brooklyn Museum, 200 Eastern Pkwy. at Washington Avenue, (718) 638-5000, www.brooklynmuseum.org

Thursday, July 24: National Busker Day

National Busker Day: Street and subway performers. $10 (suggested donation). 7 pm. Spike Hill Tavern, 184 Bedford Ave. at N. Seventh Street, (718) 218-9737, www.spikehill.com

Thursday, July 24: Katy Perry

Katy Perry: $29.50–$155.50. 7 pm. Barclays Center, 620 Atlantic Ave. at Pacific Street, (917) 618–6100, www.barclayscenter.com

Thursday, July 24: Animal encounter

Animal encounter: How did Snappy get its name? Find out in this fun event. Free. 3–4 pm. Prospect Park Audubon Center, Enter park at Lincoln Road and Ocean Avenue, (718) 287-3400, www.prospectpark.org/audubon

Thursday, July 24: “Fantastic Mr. Fox”

“Fantastic Mr. Fox”: Animated pic based on the story by Raold Dahl’s classic book . Free. 6 pm. Harbor View Lawn Brooklyn Bridge Park , @@Furman St. and Middagh St.@@, , http:://www.nycgovparks.org

Thursday, July 24: Blooming naturalists

Blooming naturalists: Play games and activities and learn all about birds. Free. 1–2 pm. Prospect Park Audubon Center, Enter park at Lincoln Road and Ocean Avenue, (718) 287-3400, www.prospectpark.org/audubon

Thursday, July 24: Blooming naturalist

Blooming naturalist: Children use fun games and activities to learn what makes birds so special. Free. Noon–4 pm. Prospect Park Audubon Center, Enter park at Lincoln Road and Ocean Avenue, (718) 287-3400, www.prospectpark.org/audubon

Thursday, July 24: Sensory room

Sensory room: For children with Autism Spectrum Disorder and their families. Space limited, first come first served. Free with museum admission. 11:30 am–12:30 pm and 2:30–3:30 pm. Brooklyn Children’s Museum, 145 Brooklyn Ave. at St. Marks Avenue, (718) 735-4400, www.brooklynkids.org

Thursday, July 24: Carousel

Carousel: Take a ride on the park’s historic carousel. $2 per ride ($9/a book of 5 tickets). Noon–6 pm. Prospect Park Children’s Corner, @@452 Flatbush Ave. at Ocean Avenue@@, , www.prospectpark.org/visit/places/carousel

Thursday, July 24: “Ai Weiwei: According to What?”

“Ai Weiwei: According to What?”: The first North American survey of the work of the provocative Chinese conceptual artist, sculptor, photographer, filmmaker, and activist. $12 (suggested). 11 am–10 pm. Brooklyn Museum, 200 Eastern Pkwy. at Washington Avenue, (718) 638-5000, www.brooklynmuseum.org

Thursday, July 24: “Submerged Motherlands”

“Submerged Motherlands”: Swoon creates a site-specific installation in the museum’s rotunda gallery. $12 (suggested). 11 am–10 pm. Brooklyn Museum, 200 Eastern Pkwy. at Washington Avenue, (718) 638-5000, www.brooklynmuseum.org

Thursday, July 24: “Anatomy of a Powerhouse: Electrifying the El”

“Anatomy of a Powerhouse: Electrifying the El”: Archival photo exhibition showing construction and early operation of the 74th Street Powerhouse. $7 ($5 for children 2–17 and seniors, free for members and children under 2). 10 am–4 pm. New York Transit Museum, Boerum Place at Schermerhorn Street, (718) 694-1600, www.mta.info/mta/museum

Thursday, July 24: Play Streets

Play Streets: The Police Athletic League is providing a safe environment for children to play in. Free. 9 am – 5 pm. Fox Playground, @@East 52nd St. and Avenue H@@, , Http://www.palnyc.org

Thursday, July 24: Cosmic Yoga

Cosmic Yoga: $15. 10 am, Noon, 7 pm. Body Actualized Center, 143 Troutman St. between Central and Evergreen avenues, (347) 770–1437, bodyactualized.org

Thursday, July 24: Pop-Up Pool

Pop-Up Pool: Jump in the water is fine. The 30 by 50 foot pool includes a sandy beach and play area with food and drinks from Lizzmonade and swim lessons available. Free. 10 am–6 pm. Pier 2 Uplands, @@Furman St. and Columbia Street@@,