Was Seth able to scrape up some Lounge Lizards? The Urban Verbs? Tex Rubenowitz (sp?)? Tiny Desk Unit? Sadly, we know it's too late for The Cramps. Black Market Baby? Minor Threat is a good guess. Dave Grohl, in some form, would be a cool surprise for his fans considering that the club was his playpen of sorts, though I highly doubt that would happen. Then again, if Dave's in town, bet he'd enjoy stopping in for the party.
Of that list, I'm thinking that The Urban Verbs have the best chance of making an appearance.