Travel and Hotels
On the first day, the Laboratoire de Physique des Solides (LPS) in Orsay will host the official inauguration and the first part of the scientific workshop. On the second day, the Centre de Nanosciences et Nanotechnologies (C2N) in Palaiseau will host the second part of the scientific workshop. Both labs are closely located in the south Paris suburbs, and can be easily reached trough the local train (RER B) that serves major Paris airports and train stations. If you come by plane, Orly airport is the best and fastest option, and if you come by fast train (TGV), Massy station is a great option although all other Paris stations are viable too. Find here more on how to access the LPS. You can reach the LPS from the RER B "Le Guichet" station, the walk includes a steep slope, so please check the bus options if you are not willing to hike.
You can reach the C2N stopping at the "Massy Palaiseau" station (RER B metro line), and taking bus 91-06 until Corbeville station. More information on the precise location of the C2N can be found here (please do NOT consider the bus information of the C2N site as valid, and refer to the previous indication if you plan to come by RER and bus.)
If you don't have a car, you may want to stay in any Hotel from Paris to Orsay that is close to the RER B. Great locations in Paris are close to the stations Luxembourg, Saint Michel or Denfert-Rochereau. In Orsay, you may want to stay at the Hôtel d'Orsay or the Hôtel Campanile. Both are walking distance to the LPS and connected to the C2N either through the RER B or the 91.06 bus.