12-12-12 is the Hurricane Sandy Benefit music event that will take place in New York's Madison Square Garden.
The Sandy Benefit will be broadcasted world-wide on TV stations and online on YouTube and other channels. The 121212 concert will start on Wednesday at 7:30pm ET. Stars include Rolling Stones, Alicia Keys, Eric Clapton, Bruce Springsteen, Kanye West, Chris Martin and many more.
See also the 121212 site.