The best GIS event in the Netherlands takes place on september 25 & 26 in Rotterdam.
For more info see: http://www.gisconferentie.nl
The Esri UC is the world’s only event that covers the entire spectrum of the geospatial industry, bringing together social, economic, business, and environmental leaders who are redefining how people work together at every scale.
For more info visit : http://www.esri.com/events/user-conference