| 11 April | Cville Sidewalks Mapathon | Charlottesville, Virginia, United States |
| 12 April | OpenStreetMap x Wikidata 月聚會 #27 | Huashan, Taipei, Taiwan |
| 13 April | Hamburger Mappertreffen | Hamburg, Germany |
| 14 April | Using maps to help prevent and respond to Gender Based Violence |
| 14 April | 3. Mapathon Rapperswil mit Missing Maps Zürich (virtuell) | Zurich, Zurich, Switzerland |
| 14 April | OpenStreetMap Michigan Meetup | Michigan, United States |
| 14 April | OpenStreetMap U.S. Virtual Mappy Hour | Kansas, United States |
| 15 April | University of Liverpool Mapathon 2021! | Liverpool, England, United Kingdom |
| 15 April | Virtual Civic Hack & Map Night | San Jose, California, United States |
| 16 April | PoliMappers: Humanitarian Mapping with Map For Future |
| 20 April | 138. Treffen des OSM-Stammtisches Bonn |
| 20 April | OSM East Midlands/Nottingham meetup (online) | Nottingham, England, United Kingdom |
| 20 April | OSM-Verkehrswende #22 (Online) | Berlin, Berlin, Germany |
| 20 April | Lüneburger Mappertreffen (online) | Lüneburg, Lower Saxony, Germany |
| 21 April | MapABQ April virtual meetup | Albuquerque, New Mexico, United States |
| 22 April | Loyola University Chicago Friends of MSF Earth Day Mapathon | Chicago, Illinois, United States |
| 23 April | Swiss OpenStreetMap Association Annual General Meeting | Weggis, Luzern, Switzerland |
| 26 April | Bremer Mappertreffen (Online) | Bremen, Free Hanseatic City of Bremen, Germany |
| 28 April | Düsseldorfer OSM-Treffen (online) | Dusseldorf, North Rhine-Westphalia, Germany |
| 30 April | [Online] OpenStreetMap Foundation board of Directors - public meeting |
| 30 April | Map The U Spring 2021 | Salt Lake City, Utah, United States |
| 4 Mei | Missing Maps London Mapathon | Westminster, England, United Kingdom |
| 4 Mei | Virtuelles Niederbayern-Treffen | Oberframmering, Landau an der Isar, Bavaria, Germany |
| 5 Mei | Stuttgarter Stammtisch (Online) | Stuttgart, Baden-Württemberg, Germany |
| 5 Mei | Stuttgart: Virtueller Stammtisch am 5. Mai 2021 |
| 11 Mei | OSM-Treffen Zürich | Zurich, Zurich, Switzerland |
| 11 Mei | Hamburger Mappertreffen | Hamburg, Germany |
| 12 Mei | Stammtisch Köln | Cologne, North Rhine-Westphalia, Germany |
| 13 Mei | 155. Berlin-Brandenburg OpenStreetMap Stammtisch (Online) | Berlin, Berlin, Germany |
| 18 Mei | 139. Treffen des OSM-Stammtisches Bonn |
| 18 Mei | Lüneburger Mappertreffen (online) | Lüneburg, Lower Saxony, Germany |
| 20–22 Mei | Mapping USA |
| 25 Mei | Virtual OpenStreetMap Belgium meeting | City of Brussels, Belgium |
| 26 Mei | Düsseldorfer OSM-Treffen (online) | Dusseldorf, North Rhine-Westphalia, Germany |
| 4 Junie | 156. Berlin-Brandenburg OpenStreetMap Stammtisch (Online) | Berlin, Berlin, Germany |
| 6 Junie | OSM-Sonntag (FOSSGIS-Konferenz 2021) | Rapperswil, Rapperswil-Jona, Sankt Gallen, Switzerland |
| 6–9 Junie | FOSSGIS-Konferenz 2021 (Online) | Rapperswil, Rapperswil-Jona, Sankt Gallen, Switzerland |
| 10 Junie | Missing Maps Artsen Zonder Grenzen Mapathon |
| 15 Junie | 140. Treffen des OSM-Stammtisches Bonn |
| 15 Junie | Lüneburger Mappertreffen (online) | Lüneburg, Lower Saxony, Germany |
| 18 Junie | Missing Maps German Red Cross Digitaltag Mapathon |
| 25 Junie | Düsseldorfer OSM-Treffen (online) | Dusseldorf, North Rhine-Westphalia, Germany |
| 9–11 Julie | State of the Map 2021 |
| 20 Julie | Lüneburger Mappertreffen | Lüneburg, Lower Saxony, Germany |
| 11 Augustus | OSM-Treffen Zürich | Zurich, Zurich, Switzerland |
| 11 Oktober | OSM-Treffen Zürich | Zurich, Zurich, Switzerland |
| 11 November | OSM-Treffen Zürich | Zurich, Zurich, Switzerland |
| 19–21 November | State of the Map Africa 2021 | Nairobi, Nairobi, Kenya |
Add your event to OpenStreetMap Calendar