L'académie équestre de Versailles - Entretiens Silencieux (14-28 july) :
Possibility to park in the Place d'Armes car park and in the Europe car park, near the stables (VINCI parking lots are charged)
La Cartoucherie - Terces (14-27 july) :
Free, tree-lined parking inside the Cartoucherie.
Les Ateliers Médicis (15-20 july) :
Free parking nearby.
Le Moulin Jaune (17 and 18 july & 31 july - 1st august) :
Parking in the Crécy-La-Chapelle business area
More info on the official Covoiturage-simple website