The conference Offene Kommunen.NRW 2015 took place on November 14th and 15th 2015 at the Bergische Volkshochschule in Wuppertal. All contents can be found in the pad of the conference.
Blog post by Carsten Große Starmann: Open data in municipalities: A door opener for more impact (in German)
Blog post by Marie Jansen, OpenNRW office: It works! Open municipalities.NRW (in German)