TreePeople hosts events nearly every weekend and works with several thousand volunteers throughout the year. We are able to do this because of our core of committed Urban Planting Supervisors. Our Supervisors help at events by leading groups of volunteers to ensure trees are planted and cared for correctly and safely. Join the team and gain key leadership skills and technical knowledge. To be trained, you must attend at least two Urban Forestry events and be at least 16 years old.