Calendrier challenge 2019.

Dates des journées du challenge 2019, pour le premier semestre:

- 11 mars.
                 - 25 mars.
                                  - 8 avril.
                                               - 15 avril.
                                                              - 29 avril.
                                                                             - 6 mai.
                                                                                         - 20 mai.
                                                                                                       - 3 juin.
                                                                                                                   - 17 juin.