Improv Everywhere regularly organizes scenes of ‘chaos’ and joy in public places.
CreativeMorning with Charlie Todd of Improv Everywhere http://www.swiss-miss.com/2009/12/creativemornings-with-charlie-todd-of-improv-everywhere.html
‘CreativeMornings’ is a monthly morning gathering of creative types. Each event includes a 10 minute lecture, followed by a 20 minute group discussion. The gathering begins at 8:30am with the topic presentation starting at 9:00am. The whole thing closes down at 10am. The events are hosted at studios/gallery spaces in NYC.