The Thirty Day Map Challenge is taking place right now on Twitter: see the #30DayMapChallenge hashtag. For the second year in a row, mapmakers are challenged to make a map based on the day’s theme. (Today’s, for example, was to map with a new tool.) It’s open to everyone; for more information and resources see the challenge’s GitHub page. Here’s the page for the 2020 challenge, which saw 7,000 maps from 1,000 contributors.