In two weeks from now, from 22 september until 26 september 5 big events from the open geo movement will be happening in Brussels.
On 22 september there will be two conferences: one FOSS4G Belgium conference organised by the local , which focuses on software for Geo. There will also be a lot of attention to open (geo) data sets provided by different governement agencies in Belgium.
On the same day in a different location the Humanitarian OpenStreetMap Team will also be gathering for their HOT summit. After both events, forces will be joined for a mapathon.
The next three days the international openstreetmap conference will be happening at VUB.
Last but not least on Monday after all events, there will be a hackday, focused on OSM and OSGeo technologies.
Completely lost track? Check
http://maptember.brussels/ for an overview.