The E-Invoicing Summit Belgium is hosted by the Federal Public Service Policy and Support, located in the WTCIII building in Brussels
FPS Policy and Support
Simon Bolivarlaan 30
At the entrance of the WTC III building is a public bicycle storage..
In the underground parking is an intern bicycle storage that is completely locked and secured. There is also place to park motor vehicles. The entrance is via the big gate of the WTC III, exit is via Volksstraat.
On the other side of the Simon Bolivarlaan you can park your car in the underground parking "WTC".
More info: http://prod.interparking.be/nl/find-parking/WTC/
For the route description, click here.