Queer sports is a big thing here, especially kickball but there’s also bocce, billiards, darts, dodgeball, and others depending on what you’re interested in. I would look into Stonewall Sports, there’s both social and competitive leagues whichever is more your vibe. If you’re musical, I’d suggest the Gay Men’s Chorus of Washington (open to all genders FYI) or the DC Different Drummers. Both are great social groups that also make fabulous music together.