In partnership with the Yosemite Climbing Association, the National Park Service puts on this five-day event each September, in celebration of National Public Lands Day. In 2019 over 2,000 volunteers cleaned up 16,429 pounds of debris from the park. The 2020 event was a virtual celebration, challenging participants to Act Local in their own communities. In 2021, the event was modified and held partly in-person, with 771 participants. Yosemite had over 1,501 volunteers in 2023 and 1,337 volunteers in 2024. Last year in 2025, over 1,400 volunteers served 13,000+ hours and cleaned up 15,290 pounds of debris in the park!