I live in Brooklyn myself, but Williamsburg isn't terrible convenient. It's equally inconvenient for people coming from UES/UWS and NJ. It would be best if we picked something equally accessible to everyone - in my experience Union Square West Village are usually good middle grounds.
That said, I'm definitely interested. Don't think I'd be able to do it on 7/20, but we should make it a regular thing (and even rotate location). Can we make a Google Group for this or something?