Groussay Park in Rambouillet opens its gates to promote ecological education and the discovery of regional biodiversity in a lush green setting. With a heritage that echoes through this park has evolved from an aristocratic hunting ground into a vital urban forest and center for environmental awareness. The event anchors the regional identity of Yvelines as a leader in public nature conservation and sustainable forestry. Visitors can participate in bird-watching sessions and workshops on identifying local tree species with regional experts. This festival delivers a high social impact by educating children and families on the importance of urban ecosystems. For ecologists it delivered valuable observations on how regional wildlife adapts to managed public spaces. The program ensures the legacy of Rambouillet natural heritage is protected and celebrated by future generations of residents.