the event in Flensburg this year is called Flensburg Nautics, see herehttp://www.nautics-flensburg.de/
sorry the whole description is only in german !!! I think nowadays it should be in english as well and due to the fact that Danmark is around the corner also in danish but.......
But somehow "ship is schiff" and so it should be possible to see the sailing ships which are part of this event.
The famous "Dampf Rundum" one of the biggest event for steamships in Europe will be held July 2013