From their event page: 

Love Your Park Week is a celebration of Philadelphia’s public parks from Saturday, May 9 – Sunday, May 17, 2026 in partnership between Philadelphia Parks & Recreation, Fairmount Park Conservancy, and the Park Friends Network. The nine-day celebration features 100+ volunteer workdays and fun, free events across the city that invite Philadelphians to get outside and explore their local parks. There’s something for everyone during Love Your Park Week – from guided hikes to local cleanups to community festivals.