After debuting in 2013 to coincide with the Corcoran's go-go themed "Pump Me Up" exhibition, the D.C. Funk/Punk Spectacular returns to the 9:30 Club for a celebration of D.C.'s homegrown music scene. Dave Grohl will emcee the May 5 event, which is billed as a birthday party for legendary Trouble Funk leader Big Tony. Trouble Funk will perform, along with a one-off supergroup called the Don't Need It's, featuring members of Bad Brains, Scream and Grohl himself. There's also a "special guest."

The poster, as you can see above, is awesome, and it's worth closer inspection if you're curious about who the bill's mystery band could be. Enhance.

There appears to be some kind of symbol placed deliberately next to the words Special Guest. It looks like a molecular model, or some tethered-orb structure you'd see in a laboratory. Enhance.

Dave Grohl, proud Virginian, legendary Nirvana drummer and lead singer for the Foo Fighters, whose second-best album is 1997's "The Colour and the Shape." Hey, wait a minute ... Enhance.

Brain: Search mid-'90s album cover repository!

[Brain rumbling in progress. Please wait.]

Now, I've been mistaken about these kinds of veiled announcements before, but given that Grohl will already be on stage, it's not much of a logical leap to conclude the Foo Fighters could perform at least a few songs here, especially considering the Foo totem on the poster. (The band doesn't have any other shows scheduled before June.)

Update: DCist's Matt Cohen presents additional visual evidence that Bad Brains could also appear as special guests.

Convinced or not, tickets for the 8 p.m. show are on sale now exclusively through the 9:30 Club box office.