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It may not be free like its neighbors downtown, but the National Building Museum sure knows how to play to the groundlings. The vaunted establishment recently invited architects to design minigolf holes “inspired by an actual building, bridge, landscape, or monument,” or even a made-up one. The museum then translated these designs into an actual golf course, which visitors can — wait for it! — actually play on. But the fun doesn’t end there: The museum will be asking visitors to name their favorite course elements, and then rewarding the most popular designer. The National Building Museum is officially the most fun repository of pretty things in D.C.

Through Labor Day at the National Building Museum, 401 F Street NW

Phone: 202/272-2448

Web: www.nbm.org

Fair: BrickFair

Comic book nerds have the San Diego Comic-Con, political hangers-on have the RNC and DNC conventions. What do Lego lovers have? BrickFair. Hardly the weirdest of special interest conventions, BrickFair is where adults and children alike can congregate to share their unabashed enthusiasm for building scaled-down Taj Mahals and re-creating pivotal scenes from “The Princess Bride.” Modelers will display their best pieces, and vendors will be selling all kinds of Lego paraphernalia, from special edition kits to tchotchkes and key chains. All ages welcome.

Aug. 4 and 5 at the Dulles Expo Center, 4320 Chantilly Center, Chantilly

Web: www.brickfair.com