It is a New York City based prank collective. Here is a website.
According to the Improv Everywhere email list:The date for 'No Pants 2011' will be announced in mid-December, 2010.
No pants by paul a.
The Engadget Show - 2009 Topics John Hodgman iPhone 5 Improv Everywhere Samsara and the New Museum 1-36 was released on: USA: 21 September 2012
The Improv was created in 1963.
Improv Asylum was created in 1998.
Improv is short for improvised meaning made up on the spot. In music (typically jazz), an improv is a solo that is not written in the music. In comedy, improv is when a comedian comes up with things as they go.
Improv - 2003 was released on: USA: 2003
Philly Improv Theater was created in 2005.
Jet City Improv was created in 1992.
Laughing Gas - improv - was created in 1992.
The Georgetown Improv Association was created in 1995.
Washington Improv Theater was created in 1986.