Taste rare and one-time-only beers this weekend at 3 Stars Brewing's Urban Farmhouse Tap Room. (Photo by Fritz Hahn/The Washington Post)

Friday, Aug. 11

Otakon at the Walter E. Washington Convention Center: After 18 years in Baltimore, one of America's largest anime conventions is moving to D.C. It's Otakon, a celebration of Japanese culture, from anime and manga to arcade games, karaoke and cosplay. Expect Q&A panel sessions with anime directors and voice actors, free video game sessions, art displays, movie screenings, dance parties and costume contests over three packed days. Through Sunday. $80-$95 in advance, $100 at the door.

Summer Soiree at the Ritz-Carlton: For the month of August, the Ritz-Carlton in Georgetown has transformed its outdoor courtyard into “Rosé All Day,” a pop-up bar featuring pink wine in multiple forms: By the bottle or glass, frozen; or in cocktails. This Summer Soiree features DJs and half-price happy hour drinks all night. 4 to 11 p.m. Free.

'90s Night at Nationals Park: “Come as you were” is the theme for the Washington Nationals' retro night, which means a performance by '90s cover band White Ford Bronco, free slap bracelets, Racing Presidents dressed as Teenage Mutant Ninja Turtles, “Britney Chicken Spears” at concession stands, and the little matter of the Nats taking on the San Francisco Giants, who have the second-worst record in the National League. (They're not quite as bad as the Phillies.) 7:05 p.m. $20-$375.

SoulBounce anniversary at Smith Public Trust: SoulBounce, a website chronicling the latest in the world of soul, R&B and grown-folks hip-hop, marks its 10th anniversary by taking over Smith Public Trust in Brookland. Phonte of the Foreign Exchange and Little Brother is the host; the evening includes a cipher featuring “special guests” on the mic, and music spun by DJ Stylus. 9 p.m. to 2 a.m. $10 in advance.

Saturday, Aug. 12

Fifth anniversary at 3 Stars Brewing: The team at 3 Stars Brewing doesn't do anything halfway. At their fifth anniversary party, the upper Northwest brewery is unveiling four new beers, including collaborations with New York's Interboro and Long Island City Beer Project, a double IP, and a barley wine made with Ohio maple syrup. That's just the beginning of the beer list, which co-founder Dave Coleman says will feature at least 30 taps, including selections for breweries that 3 Stars has previously collaborated with, such as Other Half, J. Wakefield and Graft Cider. Rappahannock Oyster is bringing oysters on the half-shell, Chiko is roasting a pig, Jerkface is making specialty jerky and Ice Cream Jubilee provides frozen treats. Entertainment comes from DJs Smudge and Keenan Orr, and a performance by the School of Rock. 1 to 7 p.m. $20; $50 VIP includes admission at noon, additional drink tickets and a swag bag.

Run for Cover at the Black Cat: The annual Run for Cover concert at the Black Cat is always one of the highlights of the summer: A parade of one-time-only cover bands lovingly/ironically paying tribute to their favorite acts on the Black Cat's main stage, with costumes, props and shenanigans galore. While the bands are always a secret, this year's flyer pays homage to Kanye West and Patti Smith, and the musicians include members of Beauty Pill, Darkest Hour, Hand Grenade Job, Heavy Breathing and Soccer Team. The night is a benefit for Girls Rock D.C., and a Girls Rock band will open the show. 8 p.m. $12.

Alexandria Sidewalk Sale: More than 50 shops in Old Town Alexandria and Del Ray will have specials this weekend, with promised discounts of up to 80 percent on new shoes, designer consignment, the latest books or vintage barware. The Visit Alexandria website has a map with a full list of merchants and deals. Through Sunday. Hours vary by location.

Supa Dupa Fly at Tropicalia: DJ Baronhawk Poitier and Makers Lab are hosting an afternoon party honoring the 20th anniversary of Missy “Misdemeanor” Elliott's debut album, “Supa Dupa Fly.” (It's true: Here's the original Washington Post review.) Expect four hours of dancing to Missy and artists she has collaborated with, including Timbaland, Aaliyah and Janet Jackson. Arrive before 6 p.m. for drink specials. 4 to 8 p.m. $10.

Sunday, Aug. 13

Rum This Block at the Liz Lot: Here's the recipe for a summer cookout: Rob Sonderman of Federalist Pig grilling barbecue; bartenders from Bar Mini and Service Bar shaking up rum cocktails and offering samples from nine rum distilleries; DJ Farrah Flosscett spinning party tunes; and epic water gun battles and games in the Whitman-Walker Clinic parking lot in the heart of 14th Street NW. Tickets cover unlimited barbecue and drinks. 2 to 7 p.m. $30.

The Roots at MGM National Harbor: Questlove and crew’s main gig these days may be as Jimmy Fallon’s official house band on “The Tonight Show,” but here’s a chance to catch them cutting loose in the fairly intimate MGM National Harbor theater. After all, their freewheeling live performances are what helped make the prolific hip-hop group famous, as opposed to drum-offs with Justin Bieber on late-night television. 8 p.m. $63 to $314.

DC Jazz Jam Eighth Anniversary Celebration at the Brixton: The DC Jazz Jam has become a Sunday night staple since it was founded at the now-closed Dahlak in 2009. A move to the Brixton two years ago hasn't diminished its regular rotation of “Monthly Master” guest artists or the strong house bands, and you'll still find a long list of local fixtures and up-and-comers who sign up to drop in for a few numbers. Celebrate eight years of the DC Jazz Jam with an extended session — four hours instead of the usual three — and an all-star house band made up of current or recent college students. Want to join in? Bring your instrument and get there early to put your name down. 6:30 to 10:30 p.m. Free.

— Fritz Hahn and Adele Chapin

Read more:

D.C. bars are hosting a month-long tiki treasure hunt

10 summer date ideas that go beyond the typical outdoor movie or concert

The best true dive bars in the D.C. area