Not sure where in the Netherlands you are, but there is an excellent train connection to Cologne. The fair itself, and the venue the meet will take place at, are easily reached with public transport from the main railway station. I am visiting as a press representative and will be staying in a hotel most of the week, taking a train back home on Saturday morning, after a few hours of sleep, hopefully, but I know many people who go to the meeting are planning on spending the night in the various bars and clubs of Cologne until the first train leaves in the morning. You could always join them if you don't fancy coming all the way to Cologne for just a few hours of fun.
