Easy! We have an events page on our website, it's at the top of the toolbar. As right now it's winter, we have a few events listed in California (as that's where plantings are happening now) but as we count down to Earth Day, starting in March, we'll be adding more events throughout North America. Our events page is focused on North America, but we do have partners where people can go abroad and be more eco-volunteers. And you can find out more about that on our website.
Sometimes companies will want to get savvy on the green side, so they'll reach out to us to ask about employee volunteering and planning an excursion to plant some trees, so we have projects we can organize for companies or group organizations just for them in that location.
And there are times of year when we do a lot of event organizing, especially spring (Earth Day) and fall (Plant a Tree day in September), so keep visiting our website to stay updated.