Where They Once Were: A talk on major battles of the Korean War. [5 p.m. Korean War Veterans Memorial, National Mall] Octopus Feeding: Learn about the giant Pacific octopus and its dynamic hunting behaviors. [11 a.m. National Zoo, 3001 Connecticut Ave., N.W.] Thomas B. Allen: Author and historian discusses the Tories and the revolutionary period. [12 p.m. Spy Museum, 800 F St., N.W.]

Julie Dexter: The acclaimed classic soul singer-songwriter performs. [10 p.m. Blues Alley, 1073 Wisconsin Ave., N.W.]

Celebrate Gay Marriage: An art exhibit on same-sex marriage in D.C. [1 p.m. Foundry Gallery, 1314 18th St., N.W.]

Athlete: An exhibit of the Sports Illustrated photography of Walter Iooss. [9 a.m. Newseum, 555 Pennsylvania Ave., N.W.]

The Cycle of XX: A celebration of Rosh Chodesh for women in their 20s and 30s. [6 p.m. Sixth and I Historic Synagogue, 600 I St., N.W.]

Hyperbolic Crochet Coral Reef: An exhibit where hyperbolic geometry meets the traditional handicraft of crochet. [10 a.m. National Museum of Natural History, 10th Street and Constitution Avenue, N.W.]

Touch of Love: An exhibit of works by artist Nurieh Mozaffari. [12 p.m. Parish Gallery, 1054 31st St., N.W.]

Secret Society: Darcy James Argue's jazz big band performs. [6 p.m. Kennedy Center, 2700 F St., N.W.]

Underground scene

Star Fk Radium: The acoustic instrumental band performs. [8 p.m. Iota Club, 2832 Wilson Blvd., Arlington]

Brian Huber: The pop rock artist performs with Gringo and Dimestore. [8 p.m. Jammin' Java, 227 E. Maple Ave., Vienna]