I went to a party once with Root Boy and the band, as well as some of the Texas Jewboys from Kinky Friedman's band. I survived, and that's all I've got to say about that.
Some of the other big name bands from the DC scene were the Nighthawks, who've gone through a lot of incarnations. The first really good incarnation of the band had Jimmy Thackery on guitar. Others have included Pete Ragusa, Jimmy Nalls, and Warren Haynes. Thackery has gone on to be a fairly big second string star. Warren, obviously, is a superstar. When I moved down to Bonita Springs in FL I heard they were going to have a blues festival, and I was all excited. Then I found out the headliner was Thackery, and it was like, I've seen him dozens of times, so I skipped it. Anyway, here's the Nighthawks:
And here's Jimmy Thackery:
Another couple of great DC/Baltimore area local superstars, Tom Principato (with the hat) and Carl Filipiak:
And finally, probably the greatest DC area guitarist of all time, Roy Buchanan:
I am proud to say I've seen all of these guys many times. Roy (and Root Boy) died way too soon, and the world is poorer for it.