In 2007 I started the Roof top Film Festival (RTFF) movement in Chennai, India, with the sole intention to take good films to the rooftop, where the hierarchy was flat and the spirit high.
I used a PB wiki where interested people could put their name. I chose an unconference setting - no audience, everyone was a participant. Participants offered their roof, a guy got his office projector from his startup, someone got in the DVDs, people bought in the food, Someone got the blankets and pillows.
We watched films all night, under the stars, and had 30 minute breaks between each film to discuss the film and get to know each other.
RTFF became a monthly event. New organizers took over after I left Chennai. A Bangalore Chapter was started called the BRTFF.