If you're participating in , you'll be switching off the lights at 8:30 p.m. local time along with millions of other people around the world in an effort to save some energy.
Martinez is one of the only three cities in the East Bay officially taking part in Earth Hour. The other two are Albany and Hayward.
What do you do with an hour of darkness? Share your (G-rated) ideas in the comments below.
Here are some suggestions: