All the talk will be held in the conference room of Batiment 34 of the science faculty of Nantes university. A map of the faculty can be found here or at the bottom of this page.
How to get there:
The nearest Tram station is "Michelet-Science" of line 2 you'll be then in front of the entrace of the faculty.
You can also use the bike service Bicloo which have a station in front of the tram stop. Or you can simply walk along the river Erdre from downtown and arrive at the back of the faculty (the entrance is the entrance right after the rowing, "Aviron" in french, club).