On October 14-15-16, the workshop will be held at Meudon Observatory, 5 place Janssen, F-92190 Meudon, in the building 9, "Grande coupole" at CIAS
(a map of Meudon observatory is available here and a map of Meudon city is available here).
Meudon Observatory is easily reachable from Paris.
On October 17-18, the colloquium will be held at Paris Observatory, 77 avenue Denfert-Rochereau, F-75014 Paris, in the "salle de l'atelier"
(a map of Paris observatory is available here and a map of the area of Paris observatory and Montparnasse railway station is available here).
Paris Observatory is easily reachable from anywhere in Paris.