FESTIVAL

UNDER THE BRIDGE The folks behind Park Slope’s Union Hall, usually a jam-packed bar and restaurant with bands in the basement and bocce ball upstairs, leave Fifth Avenue to present a night of music and science — really — at the Brooklyn Bridge Park. At 6:30 p.m., learn about life’s mysteries with Union Hall’s Secret Science Club, a lecture and cabaret series on scientific issues. A local actor and comedian, Dave Hill, hosts the session. Then, on comes the rock: A Brooklyn duo of preteen siblings, Tiny Masters of Today, perform at 7 p.m. The relative youth of the group, which includes 14-year-old Ivan and 12-year-old Ada, could be a little shocking at first. But the young punk rockers have gotten serious airplay on BBC and XFM, not to mention praise from the likes of David Bowie. They perform selections from their debut album “Bang Bang Boom Cake,” with celebrity guests that include Karen O and Nick Zinner of the Yeah Yeah Yeahs, Kimya Dawson of the Moldy Peaches, Fred Schneider of the B-52s, and Gibby Haynes of the Butthole Surfers. Hailing from Champaign, Ill., another indie rock band, Headlights, performs singles from its newest album, “Some Racing, Some Stopping,” a mixed sound that evokes classic pop, girl bands, and psychedelic rock., at 7:40 p.m. Finally, at 8:45 p.m., the French Kicks, a Brooklyn-based post-grunge rock band, headlines the night out, performing its muted, lyrically melancholy pop. By the way, all this is absolutely free — if only every night could be like this. 6:30 p.m., Tobacco Warehouse, Brooklyn Bridge Park, Brooklyn, 718-802-0603, free.

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