I add myself a session "Advanced Language Features" and a session "SQLite in Depth". I think those will be very informative for people in the audience. Maybe I also repeat the security tips session from last conference if people are interested.
For one participants, I checked trains recently. From Austria you can take night trains to Koblenz directly. Simply get on board in Austria, sleep in the train and in the morning you arrive in Koblenz just before eight o'clock in the morning.
Actually you can get direct trains to Koblenz from Stuttgart, Hamburg, Vienna, Rügen, Munich, Berlin, Kiel, Klagenfurt, Chur (Swiss), Sylt, Oberstdorf, Greifswald, Luxemburg, Nuremberg and Passau. So our friends from Vienna can simply jump in a train if they don't get a flight.
For the evenings, I reserved space at the Weindorf, a lovely place to have dinner or drink a wine or beer.
More details on the conference and Registration.