There are mapathons around the world. FIND A LOCAL EVENT
If you can't join a mapathon, you can always pick tasks from the Task Manager or even do some Mapswipe.
******
Thanks to all the organizers across the OSM community and National Societies. Special thanks to Andrew Makachia for his leadership in the IFRC Africa region and Rachel Levine, American Red Cross and OSMGEO week champion. There was a mapathon with the Finnish Red Cross last week as a pre-event for climate action. The American and Canadian Red Cross are also participating in events.
Here are some of the activities that the IFRC Africa regional office is supporting/participating:
Guinea

Mali

Sierra Leone

Uganda

Kenya

Happy mapping
[photo credit: Community mapping in Buguruni (Dar es Salaam), August 2019. Heather Leson ccby 4.0]