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Flashpoint: If you’re feeling Proustian, check out Flashpoint’s memory-focused “Penumbra.” As the name would imply, the installations, a collaborative effort by Megan Jacobs and Anna Westfall, are all about light and shadow. Reception is tonight, Fri., 4/27, from 6 to 8 p.m.

Warehouse Gallery: Show your solidarity for the venue and its longtime owners by checking out Saturday’s “Freeform Bash,” billed on the Web site as an “unconventional party.” The reception will be for exhibits “No Representation” as well as “Supple.” The latter’s curator, J.T. Kirkland, promises multiple bands, including music on the third floor, the one place that belies the building’s age. Reception is tomorrow, Sat., 4/28, from 6 to “???”.

National Air and Space Museum Steven F. Udvar-Hazy Center: If you care to go all the way out near Dulles for something other than an inconvenient flight, check out the latest in the Smithsonian “Night at the Museum” series. The Web site promises that you can “meet world-class aircraft preservation and restoration experts and hear about some of their favorite artifacts.” Tomororw, Sat., 4/28, from 7:30 to 9:30 p.m. Free. For reservations call (202) 633-2603.