i came across this event scheduled for Saturday the 18th of April.
I haven't met the people involved, but here's an except from their main site http://openeverything.net :
Open Everything is a global conversation about the art, science and spirit of 'open'. It gathers people using openness to create and improve software, education, media, philanthropy, architecture, neighbourhoods, workplaces and the society we live in: everything. It's about thinking, doing and being open.
Open Everything was started by a few people back in the beginning of 2008, and it has grown to include events in cities around the world. New York is going to be the next and we'd be delighted if you would participate.
I'll probably stop by to check it out.