I passed on getting a picture taken this time as I wasn't wearing anything particularly distinctive, just a plain black suit that actually came in the mail through Ebay that same day ($13 with shipping)
Found out why nobody was ever talking to me. It's a small club, and it everybody there noticed.
1. Nobody knew me
2. The bartender had actually gotten out of me that I work for DHS.
3. I never danced
4. I sat in the back at the bar all night, but never drank alcohol.
Conclusion: I'm carrying a gun, and I'm there on some sort of official business.
And who came up and asked? "Bowser" from Sha-Na-Na. He happened to be there that night.