You can travel to Dormagen by train to the station "Dormagen Hauptbahnhof" (sometimes described as "Dormagen Hbf"). From there Taxis are available to get to the venue. You can reach the station with the trains S11 and RE6a. The S11 connects Dormagen directly with the Airport in Düsseldorf. Direct Connection to the Airport Cologne is available with the RE6a. Time tables can be obtained via https://www.bahn.de/.
Transportation from the official partner hotels Mercure and Dorint will be available via bus transportation directly to the venue.