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Hawaiian slack key guitar, known as Ki ho’alu (“loosen the key”) in Hawaiian, is a fingerstyle guitar music unique to the islands. The simple origin story is that Mexican cowboys brought guitars to the archipelago during the 19th century, taught Hawaiians the basics, and left them to experiment on their own. What resulted was a set of unique tunings as the Hawaiians loosened the strings and integrated their own rhythms, folk songs, and dances to create solo guitar music unlike any other in the world. A festival full of it at Wolf Trap should capture that aloha spirit. Read more >>> The performance begins at 8 p.m. at The Barns at Wolf Trap, 1635 Trap Road, Vienna. $27–$32. (703) 255-1900. wolftrap.org. (Justin Weber)

EAT THIS

The Dolcezza Factory near Union Market re-opens today with a revamped menu that includes milkshakes. Priced at $8 each, flavors include “Coffee & Cookies” with Stumptown Hair Bender espresso gelato, stracciatella-covered biscoff cookies, and whipped cream; and “Cinnamon Toast Crunch” with Vietnamese cinnamon gelato, Cinnamon Toast Crunch pieces, whipped cream, and cinnamon powder. Visit from 11 a.m. to 7 p.m. on Fridays, Saturdays, and Sundays. Dolcezza Factory, 550 Penn St. NE. dolcezzagelato.com. (Laura Hayes)

OH AND ALSO

Friday: SiriusXM’s AltNation hosts an evening of indie rock at Songbyrd Music House featuring sets from Coast Modern, 888, and Sundara Karma. 8 p.m. at 2477 18th St. NW. $20–$22.

Friday: R&B artist Leela James and pop singer Daleybring their Undeniable Tour to the Warner Theatre. 8 p.m. at 513 13th St. NW. $30.

Friday: Songwriter Sallie Ford plays an early show at DC9 in support of her new album, Soul Sick. 7 p.m. at 1940 9th St. NW. $15.

Saturday: Trumpeter and bandleader Toru “Tiger” Okoshi spent his youth in Japan, absorbing the lessons and styles of masters like Miles Davis, Chick Corea, Ornette Coleman, and Herb Pomeroy. Listening to him today, you’ll hear traces of his influences across his more amorphous straight-ahead compositions, but Okoshi maintains that classic style he developed as a young musician. Read more >>> The Tiger Okoshi Quintet performs at 8 p.m. and 10 p.m. Saturday and Sunday at Blues Alley, 1073 Wisconsin Ave. NW. $35. (202) 337-4141. bluesalley.com(Jackson Sinnenberg)

Saturday: The Kennedy Center celebrates folk music icon Pete Seeger with an all-star tribute featuring Judy Collins, Roger McGuinn, and Roseanne Cash. 8 p.m. at 2700 F St. NW. $39–$135.

Saturday: Head to Hemphill Fine Arts for the opening of two new shows: a collection of watercolors and collages by African-American artist Romare Bearden, and a series of paintings made by Jacob Kainen in the 1980s following a trip he made to the Soviet Union. 6 p.m. at 1515 14th St. NW. Free.

Sunday: Maybe we should just let go. That’s one of the messages in Homo Sapiens, a 2016 film by Nikolaus Geyrhalther. “Film” is a loose word for the projecta series of extended, bracing shots of manmade landscapes abandoned by civilization. Geyrhalther’s meditation on the futility of all our follies is menacing by the same turn. Geyrhalther’s uninterrupted landscape shots of the unbuilt environment can be delicious, like the languid single-camera takes from Béla Tarr and Ágnes Hranitzky’s Werkmeister Harmonies, but for Geyrhalther the long shot is a means to an unsettling end.  Read more >>> The film screens at 2 p.m. at the National Gallery of Art East Building Auditorium, 4th Street and Pennsylvania Avenue NW. Free. (202) 737-4215. nga.gov. (Kriston Capps)

Sunday: Baltimore’s Permanent Waves takes the stage at Comet Ping Pong with local acts Escape-Ism and Aaron Leitko. 9 p.m. at 5037 Connecticut Ave. NW. $12.

Sunday: Close out the weekend at Round House Theatre and see its new production of Or, a comedy about Restoration-era playwright Aphra Behn directed by Aaron Posner. 2 p.m. at 4545 East West Highway, Bethesda. $36–$51.

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