Middelburg, Zeeland, Netherlands
Yearly 2-day Open Source Geospatial conference in mostly Dutch. Organized by OSGeo.nl and Province of Zeeland.
Sept 13th: workshops like GeoServer, and smart mapping apps like EveryDoor, for OSM. see schedule.
Sept 14: conference, 4 parallel tracks, mostly technical content, some OSM, keynotes, see schedule.
Free, pay what you like tickets through EventBrite.