This is yet another "pseudo-meetup"
The Biggest Open Municipal Data right now is NYC's data trove.
And the best way to get cracking on Big Open Data is to hack on it during this year's Bigger, Better NYCBigApps (now with BigIssues!)
Even though the event is now sold out, I highly recommend that all members of BigOpenData meetup put themselves on the waiting list and seriously consider entering NYCBigApps even if you cannot make the Expo/Hackathon this weekend.
Peace, Love and Big, Open Data!