You have to register on eventbrite (link below), RSVP'ing here has zero effect :)
Fairbanks NV will organise the second official OpenStack Conference Benelux Edition on September 17th, 2015. At this event decision makers, developers, administrators and users of OpenStack Cloud Software can get informed on the latest developments and practical implementation of OpenStack Cloud Software in the local market of the Netherlands, Belgium and Luxembourg.
Free online event registration by Eventbrite. Get your free ticket here. (http://www.eventbrite.nl/e/tickets-openstack-benelux-conference-2015-17223339472?aff=es2)