So, let's talk about the upcoming sessions...
Before deciding on whether to take on the second story of the Lonely Tower, we should first see who is available at all.
If I understand you correctly it is as follows (please correct me if I'm wrong or insufficient or didn't take you into account at all. It's no ill will, but my memory or missing information):
Jochen: available as GM on July 14, July 21, July 28, but not August 4.
Martin: available on July 14, but not July 21 and July 28.
Björn: available on July 14, unavailable on July 21, rest available.
(Coldculture): available on July 14
Sebastian: probably available on July 14, July 21, July 28, but not August 4, right?
Jan: available July 21 and July 28.
Claudia: ?
Jörg: ?
(anybody else who is interested in joing us): ?
Stephan: Available on all of those above
I will update this list with your comments.