| 21 四月 | MapABQ April virtual meetup | Albuquerque, New Mexico, United States |
| 22 四月 | Loyola University Chicago Friends of MSF Earth Day Mapathon | Chicago, Illinois, United States |
| 23 四月 | Swiss OpenStreetMap Association Annual General Meeting | Weggis, Luzern, Switzerland |
| 23 四月 | Virtual meeting of the Polish OSM Association | Cudniki, Łódź Voivodeship, Poland |
| 24 四月 | 開發者地圖大亂鬥 | Chengnei, Taipei, Taiwan |
| 24 四月 | Incontro mensile OSMers BI-VC-CVL (online) | Biella, Piemont, Italy |
| 26 四月 | Birthday of the gimmisn house numbering tool, height measurement, displaying vector tiles |
| 26 四月 | Birthday of the gimmisn house numbering tool, height measurement, displaying vector tiles | Budapest, Hungary |
| 26 四月 | Bremer Mappertreffen (Online) | Bremen, Free Hanseatic City of Bremen, Germany |
| 27 四月 | Mapatón Madrid streets | Madrid, Community of Madrid, Spain |
| 27 四月 | OSM Stammtisch Kreis Viersen | Viersen, North Rhine-Westphalia, Germany |
| 28 四月 | Mapatón online de Médicos Sin Fronteras |
| 28 四月 | Düsseldorfer OSM-Treffen (online) | Dusseldorf, North Rhine-Westphalia, Germany |
| 30 四月 | [Virtual Event] GeOsm : Let’s put ourselves on the map! | Ebolbam, Centre, Cameroon |
| 30 四月 | [Online] OpenStreetMap Foundation board of Directors - public meeting |
| 30 四月 | Map The U Spring 2021 | Salt Lake City, Utah, United States |
| 30 四月 | Virtual meeting of the Polish OSM Association | Cudniki, Łódź Voivodeship, Poland |
| 4 五月 | Missing Maps London Mapathon | Westminster, England, United Kingdom |
| 4 五月 | Virtuelles Niederbayern-Treffen | Oberframmering, Landau an der Isar, Bavaria, Germany |
| 5 五月 | Stuttgarter Stammtisch (Online) | Stuttgart, Baden-Württemberg, Germany |
| 5 五月 | Stuttgart: Virtueller Stammtisch am 5. Mai 2021 |
| 6 五月 | Dresdner OSM-Stammtisch | Dresden, Saxony, Germany |
| 6 五月 | Missing Maps DRK Online Mapathon - Einführung JOSM |
| 7 五月 | Virtual meeting of the Polish OSM Association | Cudniki, Łódź Voivodeship, Poland |
| 10 五月 | OSM x Wikidata Taipei #28 | Huashan, Taipei, Taiwan |
| 11 五月 | OSM-Treffen Zürich | Zurich, Zurich, Switzerland |
| 11 五月 | Hamburger Mappertreffen | Hamburg, Germany |
| 12 五月 | Stammtisch Köln | Cologne, North Rhine-Westphalia, Germany |
| 12 五月 | OpenStreetMap Michigan Meetup | Michigan, United States |
| 13 五月 | 155. Berlin-Brandenburg OpenStreetMap Stammtisch (Online) | Berlin, Berlin, Germany |
| 14 五月 | Virtual meeting of the Polish OSM Association | Cudniki, Łódź Voivodeship, Poland |
| 18 五月 | 139. Treffen des OSM-Stammtisches Bonn |
| 18 五月 | Lüneburger Mappertreffen (online) | Lüneburg, Lower Saxony, Germany |
| 20–22 五月 | Mapping USA |
| 20 五月 | Missing Maps DRK Online Mapathon |
| 21 五月 | Virtual meeting of the Polish OSM Association | Cudniki, Łódź Voivodeship, Poland |
| 25 五月 | East Midlands OSM Pub Meet-up : Derby | Derby, England, United Kingdom |
| 25 五月 | Virtual OpenStreetMap Belgium meeting | City of Brussels, Belgium |
| 26 五月 | Düsseldorfer OSM-Treffen (online) | Dusseldorf, North Rhine-Westphalia, Germany |
| 28 五月 | Virtual meeting of the Polish OSM Association | Cudniki, Łódź Voivodeship, Poland |
| 4 六月 | 156. Berlin-Brandenburg OpenStreetMap Stammtisch (Online) | Berlin, Berlin, Germany |
| 6–9 六月 | FOSSGIS-Konferenz 2021 (Online) | Rapperswil, Rapperswil-Jona, Sankt Gallen, Switzerland |
| 6 六月 | OSM-Sonntag (FOSSGIS-Konferenz 2021) | Rapperswil, Rapperswil-Jona, Sankt Gallen, Switzerland |
| 10 六月 | Missing Maps Artsen Zonder Grenzen Mapathon |
| 15 六月 | 140. Treffen des OSM-Stammtisches Bonn |
| 15 六月 | Lüneburger Mappertreffen (online) | Lüneburg, Lower Saxony, Germany |
| 18 六月 | Missing Maps German Red Cross Digitaltag Mapathon |
| 25 六月 | Düsseldorfer OSM-Treffen (online) | Dusseldorf, North Rhine-Westphalia, Germany |
| 9–11 七月 | State of the Map 2021 |
| 20 七月 | Lüneburger Mappertreffen | Lüneburg, Lower Saxony, Germany |
| 11 八月 | OSM-Treffen Zürich | Zurich, Zurich, Switzerland |
| 24 八月 | East Midlands OSM Pub Meet-up : Derby | Derby, England, United Kingdom |
| 11 十月 | OSM-Treffen Zürich | Zurich, Zurich, Switzerland |
| 11 十一月 | OSM-Treffen Zürich | Zurich, Zurich, Switzerland |
| 19–21 十一月 | State of the Map Africa 2021 | Nairobi, Nairobi, Kenya |
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