Hello Sarah,

Really excited that WCEU 2017 will take place in Paris.
I feel there might be a confusion as to where exactly it will happen, and that your venue link is wrong, probably because there is another similarly named place in the 13th district that comes up first in Google results.
It was confirmed by Jenny Beaumont that the WordCamp Europe 2017 will take place in Les Docks de Paris, not just "les docks", and this is just north of Paris near the big Stade de France football stadium, at

LES DOCKS DE PARIS
50, av. du Président Wilson - 93200 La Plaine Saint-Denis

The site is at http://www.eurosites.fr/location-salle/paris/quartier/salles-de-formation-a-saint-denis

Just in case people would plan accomodation way ahead, and to avoid having to ship hundreds od stranded people from the south of Paris all the way back up north on that day :-)