Dear wikimedians, For the third year in a row, cartographer and open data lover Topi Tjukanov has organized the #30daysmapchallenge. You have all the information here: https://github.com/tjukanovt/30DayMapChallenge.
I send this, because I know there are lots of cartography enthusiasts in our movement who would be glad to take part in this challenge and contribute with those maps to articles in Wikipedia, to Commons or, upload and reuse information from Wikidata. I personally enjoyed last year challenge and contributed to some articles and learnt about tools to import data from Wikidata into QGIS.
Sincerely
Galder