| 20th February–8th March | Remote mapping party in Penza | Домашняя картовечеринка в Пензе | Penza, Penza Oblast, Russia |
| 6th March | Open Data Day - OSM - YouthMappers USSEIN | Kaolack, Senegal |
| 6th March | Open Data Day 2021 |
| 6th March | Tanzania Data Lab + OpenMap Development Tanzania: HIV/AIDS hotspots and testing facilities Mapathon | Dar es Salaam, Tanzania |
| 6th–7th March | OpenStreetMap Uganda Mapping Uganda's New Cities Mapthon | Kampala, Central Region, Uganda |
| 6th March | Open Data Day Taiwan 2021 | Huashan, Taipei, Taiwan |
| 6th March | MAPAbabae 2021: #ChooseToChallenge Gender Inequality in Open Mapping | Quezon City, Philippines |
| 6th March | Open Gender Data for Tanzania - What is missing? Why does it matter? |
| 8th March | Missing Maps American Red Cross International Women's Day Mapathon 2021 |
| 8th March | #VisibleWomen : an initiative by Kathmandu Living Labs to put women on the map | Kathmandu, Nepal |
| 8th March | Missing Maps CartONG Mapathon |
| 8th March | OSM x Wikidata #26 | Huashan, Taipei, Taiwan |
| 8th March | International Women’s Day – Ladies Night Mappy Hour | Kansas, United States |
| 9th March | Hamburger Mappertreffen | Hamburg, Germany |
| 10th March | Briefing on OSMF 2021 Community Survey |
| 10th March | Torino Virtual Mapping Party 2021 |
| 10th March | OpenStreetMap Michigan Meetup | Michigan, United States |
| 10th March | Missing Maps German Red Cross Einführung JOSM Mapathon |
| 10th March | Briefing on the 2021 OSMF Community Survey |
| 11th March | Briefing on the 2021 OSMF Community Survey |
| 11th March | NIGERIA SE4ALL Remote Mapathon |
| 11th March | UN Mappers weekly mapathon |
| 11th March | OSM-Treffen Zürich | Zurich, Zurich, Switzerland |
| 11th March | 153. Berlin-Brandenburg OpenStreetMap Stammtisch (Online) | Berlin, Berlin, Germany |
| 11th March | Münchner OSM-Stammtisch | Munich, Bavaria, Germany |
| 12th–13th March | Remote DB Regio Hackathon | Berlin, Berlin, Germany |
| 12th March | Collaborative and Humanitarian Mapping #2: Mapping deforestation in the Amazon rainforest with JOSM |
| 13th March | Missing Maps Friends of MSF Lancaster Mapathon |
| 13th March | She Maps & GIS | Para Djicoroni, Bamako, Mali |
| 15th March | Missing Maps CartONG Mapathon |
| 16th March | 137. Treffen des OSM-Stammtisches Bonn |
| 16th March | OSM-Verkehrswende #21 (Online) | Berlin, Berlin, Germany |
| 16th March | Lüneburger Mappertreffen (online) | Lüneburg, Lower Saxony, Germany |
| 17th March | MapABQ March virtual meetup | Albuquerque, New Mexico, United States |
| 18th March | Virtual Civic Hack & Map Night | San Jose, California, United States |
| 19th March | UN Mappers weekly mapathon |
| 22nd March | Missing Maps CartONG Mapathon |
| 22nd March | Bremer Mappertreffen (Online) | Bremen, Free Hanseatic City of Bremen, Germany |
| 23rd March | Missing Maps CZ Mapathon 2021 #2 |
| 24th March | Geomob ft. Michael Montani (Unite Maps, UN Mappers) |
| 24th March | OpenStreetMap U.S. Virtual Mappy Hour | Kansas, United States |
| 24th March | OpenStreetMap U.S. Virtual Mappy Hour (duplicate) | Kansas, United States |
| 25th March | GISRUK Webinar: Semantic geographic knowledge on a world-scale, interlinking OpenStreetMap and knowledge graphs |
| 25th March | UN Mappers weekly mapathon |
| 26th March | Mapio Cymru: Found in a map of Wales Workshop |
| 26th March | [Online] OpenStreetMap Foundation board of Directors - public meeting |
| 26th March | Webinar GEAM - GFOSS.it: OpenDroneMap, un ecosistema libero per foto aeree |
| 26th March | Collaborative and Humanitarian Mapping #3: Mapping informal settlements with Mapillary and JOSM |
| 26th March | Düsseldorfer OSM-Treffen (online) | Dusseldorf, North Rhine-Westphalia, Germany |
| 29th March | OpenStreetMap Hungary 2021 March | Budapest, Hungary |
| 29th March | Missing Maps CartONG Mapathon |
| 30th March | Virtual OpenStreetMap Belgium meeting | City of Brussels, Belgium |
| 31st March | UN Mappers weekly mapathon |
| 6th April | Missing Maps London Mapathon | Westminster, England, United Kingdom |
| 6th April | Virtuelles Niederbayern-Treffen | Oberframmering, Landau an der Isar, Bavaria, Germany |
| 6th April | Stuttgarter Stammtisch (Online) | Stuttgart, Baden-Württemberg, Germany |
| 7th April | Numérique Éducatif Libre Webinaire : Quels usages pédagogiques avec OpenStreetMap ? |
| 8th April | Missing Maps Artsen Zonder Grenzen Mapathon |
| 8th April | Missing Maps Studentendesk Rode Kruis Maastricht |
| 9th April | 154. Berlin-Brandenburg OpenStreetMap Stammtisch (Online) | Berlin, Berlin, Germany |
| 13th April | Hamburger Mappertreffen | Hamburg, Germany |
| 16th April | Humanitarian Mapping with Map For Future |
| 20th April | 138. Treffen des OSM-Stammtisches Bonn |
| 20th April | Lüneburger Mappertreffen (online) | Lüneburg, Lower Saxony, Germany |
| 23rd April | Swiss OpenStreetMap Association Annual General Meeting | Weggis, Luzern, Switzerland |
| 28th April | Düsseldorfer OSM-Treffen (online) | Dusseldorf, North Rhine-Westphalia, Germany |
| 11th May | OSM-Treffen Zürich | Zurich, Zurich, Switzerland |
| 11th May | Hamburger Mappertreffen | Hamburg, Germany |
| 12th May | Stammtisch Köln | Cologne, North Rhine-Westphalia, Germany |
| 13th May | 155. Berlin-Brandenburg OpenStreetMap Stammtisch (Online) | Berlin, Berlin, Germany |
| 18th May | 139. Treffen des OSM-Stammtisches Bonn |
| 18th May | Lüneburger Mappertreffen (online) | Lüneburg, Lower Saxony, Germany |
| 26th May | Düsseldorfer OSM-Treffen (online) | Dusseldorf, North Rhine-Westphalia, Germany |
| 6th June | OSM-Sonntag (FOSSGIS-Konferenz 2021) | Rapperswil, Rapperswil-Jona, Sankt Gallen, Switzerland |
| 6th–9th June | FOSSGIS-Konferenz 2021 | Rapperswil, Rapperswil-Jona, Sankt Gallen, Switzerland |
| 10th June | Missing Maps Artsen Zonder Grenzen Mapathon |
| 15th June | 140. Treffen des OSM-Stammtisches Bonn |
| 15th June | Lüneburger Mappertreffen (online) | Lüneburg, Lower Saxony, Germany |
| 18th June | Missing Maps German Red Cross Digitaltag Mapathon |
| 25th June | Düsseldorfer OSM-Treffen (online) | Dusseldorf, North Rhine-Westphalia, Germany |
| 9th–11th July | State of the Map 2021 |
| 20th July | Lüneburger Mappertreffen | Lüneburg, Lower Saxony, Germany |
| 11th August | OSM-Treffen Zürich | Zurich, Zurich, Switzerland |
| 11th October | OSM-Treffen Zürich | Zurich, Zurich, Switzerland |
| 11th November | OSM-Treffen Zürich | Zurich, Zurich, Switzerland |
| 19th–21st November | State of the Map Africa 2021 | Nairobi, Nairobi, Kenya |
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