While Earth Day started in the US in 1970, it has become an international reason to take a stand on environmental issues. And you can get in on the act. For events going on in your area, take a look at this Earth Day Event Map.

And if you don’t see something of interest, consider starting your own Earth Day activity. For instance, you could host a green scavenger hunt. Just arm scavenger participants with disposable cameras and have teams race to be the first one to fill the camera with pictures of people doing eco-friendly things.

For more ways to join in the fun, visit the Earth Day in a Box event planning site with ideas, tips, and help.