Kids and their families can learn about sustainability while having fun on the farm at the annual Northern Virginia Sustainability Fair on Saturday, Sept. 13 at Frying Pan Park in Herndon.

The free event runs from 10 a.m. to 3 p.m.

The fair is sponsored by the The Three Birds Foundation, a nonprofit that “develops renewable energy initiatives that engage and inspire students, thus creating a culture of curiosity and environmental stewardship.” The fair is part of the Green Apple Day of Service, a worldwide initiative that  is dedicated to growing the green schools movement, says the Three Birds Foundation.

Bring a picnic lunch or purchase food from Gordon’s Grill. There will be free wagon and carousel rides all day.