Hi Pedro,
Since no one has replied yet, I'll take a stab.
First of all, welcome.
The LW Paris group is rather small, at least the active part. Mostly programmers/students/researchers (I'm the later). During the academic year we had semi-regular small social meetups (dinner, games, conversation) every two weeks at Cite Universitaire. Some people live outside of Paris and can not make those, and surely some just find them not useful/fun enough to attend :)
For both these and the less frequent "larger" meetups the language is English. A fair number of people are from abroad (German, (US) American).
Not sure how the meetups will happen over the summer. (There was interest in seeing "Transcendence" once it comes out in France, but that's in a month.) But if you are in the group you'll presumably get the announcements now -- when one comes out do come say hello in person. You are also free to propose something :)
Best,
M.