It does seem the only agenda on the Saturday is for likeminded individuals with a interest or even a willingness to express a interest to have a venue to visit and have a musical encounter.
This is quite different to a typical arranged demonstration, as the fundamental is all about meeting with others.
I only know of one other arrangement that comes close to this, that I have not been able to experience, even though a Journey through mainland Europe once got me close to dates of being able to have the experience, and that one is in Aachen in Germany.