World Earth Hour happens this coming Saturday (It is always observed on the last Saturday of March.) wherever you are on Earth at 8:30 p.m. Local Time.
Another interesting site explaining Earth Hour and all kinds of family activities is from the group that started it in 2007: World Wildlife Fund.
Here is a story about it from hometownlife.com – Earth Hour
timeanddate.com tells it like this.
Check out also earthhour.org .
How dark will your city/town/village get? We will see!