I have always enjoyed promoting this very simple event. It only takes dimming your lights for a single hour to make a statement (but promotes activities and conservation that should be practiced throughout the year). When I served as Mayor, I enjoyed invitations to enjoy some great candlelit outdoor parties to jointly mark the event. Fun times for a great purpose.
Go to Earth Hour.org for more information.
New York is participating. The Intercontinental Barclay has posted this sign proudly annoucing its participation:
Thinking locally, in considering a great place to spend Earth Hour, I am thinking that it would be a great night to take the family to Bill Sadowski Park,and Nature Preserve a County Park in Palmetto Bay, 17500 SW 78th Ave, where the Southern Cross Astronomical Society puts out its telescopes each Saturday evening from 8 - 10:00 PM, "weather" permitting. It is a great event to come to view, solo or with friends and/or the family.