The date is unknown, but it’s supposed to happen soon, Marion Cotillard mentioned it in this interview:

Marion Cotillard has enjoyed hanging out with ”fun” actress Jennifer Lawrence. Both actresses have been muses for fashion house Dior and the 38-year-old beauty can’t wait for their next meeting because they get along so well. When asked by Stylist magazine who makes her laugh the most right now, Marion replied:

”Will Ferrell! My friends. I have very, very funny friends. They make me laugh because I laugh so hard. Oh and Jennifer Lawrence. Yeah, that’s a good list. ‘I have a Dior dinner, which I’m looking forward to because they’re amazing, funny people. And Jennifer Lawrence will be there so I’m going to have a lot of fun.”

Source: JenLawUS