French conversation hour ideas

A group of English and French speakers are starting a French/English/Polyglot Conversation hour to help English speakers practice thier French and French speakers to practice thier English. Would you share ideas for conversation and language games that you may have? This is an adult group.

If you don't get much response here, I would post this in The Staff Room group as many of the members run similar things and will probably have some good suggestions. Bonne chance!