(mods, feel free to delete this. I just thought I would put up a more comprehensive post since I haven't seen one yet)
(
source)
I don't speak French fluently, but from what I can understand Chris and Roberto Aguire are scheduled to be there on the 12th of June for the opening night of the festival and a projection of Struck By Lightning (in France the movie is called
Struck) at the Publicis Cinémas (Facebook event
here). There will also be a Q&A with the audience. On the 13th there will be another preview (Facebook event
here), this time at the UGC Ciné Cité les Halles. Both Chris and Roberto will be there and it will be followed by a Q&A, too. Tickets for the first preview are going on sale May 15th at 8 am local time (6 am GMT)
here.
Chris will also do a signing on the 15th of June at the Fnac de Ternes in Paris in the afternoon (we still don't know the exact time). (
source)
Darren is going to be there on the 18th with Kristen Wiig for the European preview of Girl Most Likely (although in France it's going to be called
Imogene) at the Publicis Cinémas (Facebook event
here). They will both take part in a Q&A with the audience.
Imogene will come out in France on the 8th of August, and Struck on the 19th of June.