Photo by Flickr user alsacienne

OZ: It’s the 75th Anniversary of The Wizard of Oz. Explore little known facts and behind-the-scenes secrets with Michael Patrick Hearn, “the leading authority on The Wizard of Oz” at the National Museum of American History, in the Warner Bros. Theater (Constitution Avenue NW b/w 12th & 14th Streets) 6:45-8:45 p.m. $30-42

TRIVIA: The American Cool exhibit closes in just under a month. Test your knowledge of American icons and figures during trivia night at The National Portrait Gallery. Food and drink from the Courtyard Cafe will be available for purchase. (8th and F Streets NW) 6:30-7:30 p.m. Free

SMALLS: NoMa Summer Screen continues with The Sandlot. (2nd and L Streets NE) Movie begins at sundown. 7 p.m. Free

ARCHIVES: The Society of American Archivists will be in town through Saturday for their Annual Meeting. To celebrate D.C.’s A/V heritage, The Black Cat will screen audio and video from local collections. (1811 14th Street NW) 8 p.m. Free

FILM: Some people set themselves on fire for YouTube fame. Others set themselves on fire as a form of protest. Watch a historical case of the latter as the Embassy of the Czech Republic screens Burning Bush as part of the “Lions of Czech Film Series” at The Avalon Theatre (5612 Connecticut Avenue NW) 6:45 p.m. $15

BIKE RIDE: Celebrate the dog days of summer with DC Bike Party as they go on their High Tide Ride tonight. Put on your beach gear for a leisurely bike ride that leaves from the Dupont Circle fountain at 7:30 p.m. Afterwards, cool off with an after party at Iron Horse, which will feature a bike raffle “and some legit beer specials for everybody,” courtesy of New Belgium Brewing Company. Free, more info here.