Saturday, March 29 at 8:00 pm local time. Turn off your lights!
I don't live in one of the participating cities, but I still want to take part. Not only for the environmental statement it will make, but just because it's a cool concept for millions of people across the world to be doing the same thing at the same time. I'd like to see a satellite view of Chicago at 7:59, and at 8:01. Awesome!