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BIOLOGIST DARCY KELLEY LECTURES ON FUNKY FROG CALLS AND ANIMAL COMMUNICATION, 8 PM Birds do it, bees do it—even frogs with claws in South Africa do it! Take a wild tour of brain science with Columbia University neurobiologist Darcy Kelley as she probes the courtship songs of Xenopus frogs—including “rapping.” Have you ever wondered how male and female animals find each other, and what pick-up lines they use? Kelley’s research examines sexual strategies and the fascinating (and feisty!) world of animal communication. SOUND ARTIST KATIE DOWN AND HER GLASS MENAGERIE, 9:15 PM Composer and improviser Katie Down creates a sight-and-sound sensation. Echoing, ringing, buzzing, and tinkling, her silica-based instruments include a crystallophone made of wine goblets, glass tubes and bells, fish bowls, and an all-glass glockenspiel. Katie Down will be joined by artists Caleb Burhans on viola and voice, Taylor Ho Bynum on cornet, and dancer Rachel Bernsen. --Before: Groove to tunes inspired by bul

Union Hall’s Secret Science Club is Blasting off to the Brooklyn Academy of Music [BAM] for a science soirée and concert of INTERGALACTIC dimensions. Saturday, April 21 Union Hall’s “Secret Science Club,” the Brooklyn Philharmonic, and The Onion present: A Night of Cosmic Delights A performance of Gustav Holst’s “The Planets” — accompanied by the New York premiere of exclusive NASA footage—is launched in BAM’s mothership of an opera house by the Brooklyn Philharmonic. The Secret Science Club is onboard with a pre-concert soirée, featuring free cosmic brew and a chance to “Ask the Astrophysicist.” Price: $25. Call (718) 488-5913 for tickets--and don't forget to use the "Secret Science Club" password! Pre-concert astronomy soirée, sponsored by The Onion , at 7 p.m. Grab yourself a rocket-fueled libation, and ask our resident astrophysicist questions like “What is dark matter?” and “Why is Pluto no longer a planet.” Impress your friends and rub elbows with the stars.. Fre