On the occasion of the World Environment Day, on 5 June 2010, the gates of the Ariana Park were opened to the public. Didactic activities show casing the biodiversity within the Ariana Park encouraged the public to discover the rich flora of the Park. A treasure hunt game and a "Snakes & Ladders" game on a human scale particularly interested the young public.
On the occasion of this Open day, more than a dozen of shows were organized on three open-air stages in the Ariana Park : stage "Sphere", by the Armiliary sphere, in the Cour d'honneur ; stage "Serpent" by the bar Serpent in the new building, and stage "Pelouse", situated in the gargen of the Villa "La pelouse".
The garden of the villa "La Pelouse" welcomed a wild and frantic "Lion's Dance", performance of martial art by the Lausanne Wushu Institut
The balcony on the ground floor of the Villa was the perfect location to host the magnificent "Tea Ceremony" offered by the Permanent mission of Japan. The public came in numbers to enjoy this particular event. The master of ceremony offered then to the captured public a tea tasting session.
An exuberant demonstration of Capoeira, offered by the Capoeira group volta do mundo – Geneva
, supported by the permanent mission of Brazil, closed the shows performed in the "Villa Pelouse" space. The boisterous rhythms of the tam-tams accompanied by the singing attracted an enthusiastic public to the grounds around the Villa.