TUEBIX 2019, Tübingen, Germany - no date yet, no CfP yet
Linuxwochen Wien 2019, Vienna, Austria, 2019-05-02 - 2019-05-04 (no CfP yet)
Pi and More 11 1/2, Krefeld, Germany, 2019-04-06 - sorry, X2Go won't be there, not enough volunteers in that region. :(
LinuxInfoTag Augsburg 2019, Augsburg, Germany - No date yet, no CfP yet
Chemnitzer LinuxTage 2019 (2019-03-16 - 2019-03-17) - no, not going to be there. Both due to the political situation there (right-wing riots, police force obviously infiltrated by the right) as well as due to lack of volunteers.
Linux Expo Ulm 2019, Ulm, Germany - if it takes place at all