Photo by John Sonderman.

MATH: Learn the math behind card tricks with Professor Colm Mulcahy. A Celebration of Mind event, honoring the legacy of Martin Gardner, “The Best Friend Mathematics Ever Had.” Marian Koshland Science Museum (525 E Street NW) 6:30-8:30 p.m. $7-10

LETTERPRESS: At this month’s Wine & Design at the National Postal Museum, you can watch a demonstration of the museum’s antique spider press, then design your own cards on a letterpress machine. Ticket price includes wine or beer. National Postal Museum-Byrne Education Loft (2 Massachusetts Avenue N) 5-7 p.m. $11.50

WEIRDOS: The Found Footage Festival’s “Salute to Weirdos” has arrived in D.C. Pool hustling, piano playing rabbits, and Arnold Schwarzenegger are just some of the things you might see. E Street Cinema (555 11th Street NW) 8 p.m. $13-15