RADIO DAYS The host of the WFUV radio show “The Big Broadcast,” Rich Conaty, introduces a screening of a 1932 comedy of the same name. “The Big Broadcast” stars some of the era’s most popular radio stars – including Kate Smith, Cab Calloway, George Burns, and Gracie Allen – in the story of a group of performers determined to save their station using the tried-and-true “Let’s put on a show!” method. Tonight, 7:25 p.m. show introduced by Mr. Conaty, 1 p.m. and 4:10 p.m. additional screenings, Film Forum, 209 W. Houston St., between Sixth Avenue and Varick Street, 212-727-8110, $10 general, $5 members and children under 12, $5 seniors Monday-Friday before 5 p.m.

LIGHT = ACTION Solar One, a solar-powered building located on a 2-acre plot along the East River, presents the Solar-Powered Film Festival. Up next, director Albert Maysles discusses his 1995 documentary “Grey Gardens,” about two cousins of Jacqueline Onassis who live in a ramshackle mansion in the Hamptons. Tonight, 8:45 p.m., Stuyvesant Cove Park, East 23rd Street and FDR Drive, 212-688-4800, $6 suggested donation.

KEY LARGO TO CHINATOWN The Brooklyn Bridge Park Conservancy’s outdoor film festival kicks off with a screening of John Huston’s “Key Largo,” starring Humphrey Bogart and Lauren Bacall (July 7). Other water-themed movies to be screened against a backdrop of the Manhattan skyline and the Brooklyn Bridge include “A Fish Called Wanda” (July 21), “Mermaids” (August 4), and “Chinatown” (August 11). Before each screening, a DJ spins music relating to that night’s film – surfing tunes before “Gidget” (July 14), and suave ’60s bachelor-pad music before “Dr. No” (July 28). Lawn chairs are available for rental. Thursdays, tonight-August 11, sunset, Empire-Fulton Ferry State Park, along the East River between Main Street and New Dock Street, free. Please go to www.brooklynbridgepark.org for a full schedule and more information.

CRITICAL CYCLE The new documentary “Still We Ride” explores the monthly Critical Mass ride, which organizers call a “bicycle celebration” and critics call a dangerous nuisance. The film includes a segment on the August 2004 arrests of 264 bicyclists participating in the ride days before the Republican National Convention. A 45-minute program of “more light-hearted” shorts accompanies the film. Proceeds from the screening go to the legal defense of New York City bicyclers arrested in the ongoing crackdown. Tomorrow, 7 p.m., Anthology Film Archives, 32 Second Ave. at 2nd Street, 212-505-5181, $8 general, $6 seniors and students, $5 members.

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