| 11th April | Cville Sidewalks Mapathon | Charlottesville, Virginia, United States |
| 13th April | Hamburger Mappertreffen | Hamburg, Germany |
| 14th April | Using maps to help prevent and respond to Gender Based Violence |
| 14th April | 3. Mapathon Rapperswil mit Missing Maps Zürich (virtuell) | Zurich, Zurich, Switzerland |
| 14th April | OpenStreetMap Michigan Meetup | Michigan, United States |
| 14th April | OpenStreetMap U.S. Virtual Mappy Hour | Kansas, United States |
| 15th April | University of Liverpool Mapathon 2021! | Liverpool, England, United Kingdom |
| 15th April | Virtual Civic Hack & Map Night | San Jose, California, United States |
| 16th April | PoliMappers: Humanitarian Mapping with Map For Future |
| 20th April | 138. Treffen des OSM-Stammtisches Bonn |
| 20th April | OSM-Verkehrswende #22 (Online) | Berlin, Berlin, Germany |
| 20th April | OSM East Midlands/Nottingham meetup (online) | Nottingham, England, United Kingdom |
| 20th April | Lüneburger Mappertreffen (online) | Lüneburg, Lower Saxony, Germany |
| 21st April | MapABQ April virtual meetup | Albuquerque, New Mexico, United States |
| 22nd April | Loyola University Chicago Friends of MSF Earth Day Mapathon | Chicago, Illinois, United States |
| 23rd April | Swiss OpenStreetMap Association Annual General Meeting | Weggis, Luzern, Switzerland |
| 26th April | Bremer Mappertreffen (Online) | Bremen, Free Hanseatic City of Bremen, Germany |
| 28th April | Düsseldorfer OSM-Treffen (online) | Dusseldorf, North Rhine-Westphalia, Germany |
| 30th April | Map The U Spring 2021 | Salt Lake City, Utah, United States |
| 30th April | [Online] OpenStreetMap Foundation board of Directors - public meeting |
| 4th May | Missing Maps London Mapathon | Westminster, England, United Kingdom |
| 4th May | Virtuelles Niederbayern-Treffen | Oberframmering, Landau an der Isar, Bavaria, Germany |
| 5th May | Stuttgart: Virtueller Stammtisch am 5. Mai 2021 |
| 5th May | Stuttgarter Stammtisch (Online) | Stuttgart, Baden-Württemberg, 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 |
| 20th–22nd May | Mapping USA |
| 25th May | Virtual OpenStreetMap Belgium meeting | City of Brussels, Belgium |
| 26th May | Düsseldorfer OSM-Treffen (online) | Dusseldorf, North Rhine-Westphalia, Germany |
| 4th June | 156. Berlin-Brandenburg OpenStreetMap Stammtisch (Online) | Berlin, Berlin, Germany |
| 6th–9th June | FOSSGIS-Konferenz 2021 (Online) | Rapperswil, Rapperswil-Jona, Sankt Gallen, Switzerland |
| 6th June | OSM-Sonntag (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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