Calpine and the Middletown Art Center will hold their 3rd Annual Earth Day Celebration at the Calpine Geothermal Visitor Center in Middletown on Saturday from 1 to 6 pm. The free event will include educational booths, garden tours, and demonstrations with the Middletown Community Garden team. There will be a vendor market as well as health food offerings, and activities for the kids, including a petting zoo and art activities. There will be a special raffle in support of the Middletown Community Garden’s new gazebo project. For more information, go to middletownartcenter.org.