Thanks Benoit Rochon for the calendar addition and for specifying the language, user registration and diet restrictions. On the other hand, using the notice for 2 months out of 12 is rather extreme and would benefit from some impact assessment on your end (maybe considering discussion participants or such?).
As a simple tweak to make sure that all users who log in know about the initiative while not being brought to hate it by an excessive repetition, you may further improve the diet by reducing it to 5 (or less) impressions every 2 weeks. Considering that there are many French-language wikis and that active users visit them with multiple devices, that will still mean seeing the notice dozens times, as opposed to hundreds in the currently proposed diet. Nemo 08:27, 2 January 2018 (UTC)