Hello Jean-Pierre,
I got feedback from SOTA-BW members that they intend to support the HB9SOTA Mountain Activation Day with activations in the DM/DL (and other) associations. So, count us in. We have marked the weekend in our calendar 
@F5HTR: The same is true for the French Mountain Activation Day, of course!
Looking forward to many S2S-QSOs!
73, Roman