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