Devoxx France is a 2 conference highlights on three days. The first day, called “University” allows you to attend lengthy presentations and attend workshops. For example a session on Docker, and a workshop on Angular 2, and finally presentation tools in the late afternoon.
On Thursday and Friday, first Devoxx France offers keynotes, around prestigious speakers, then a cycle of 8 conferences every 50 minutes. You can build your own agenda and follow different sessions as you wish.