The best resource for associations in Switzerland:
I personally have been involved in many small “Vereins”, for just renting a studio, organizing a festival or anything we always make new associations, and then sometimes just disband them after the project.
In other cases we aim at a longer term member-based association and here are some examples:
International Hackteria Society
Foundation meeting notes:
And the constantly updated Constitution, edited on the wiki directly and as .pdf to deposit.
Hackteria’s Constitution, bi-lingual, simple