A particularly successful form of multi-stakeholder cooperative is the Italian social cooperative, of which some 11,000 exist.  1 Type A social cooperatives bring together providers and beneficiaries of a social service as members.
The sport of Quidditch gets its name from Queerditch Marsh, the location of the first recorded game. A witch by the name of Gertie Keddle lived on the edge of the marsh around the year 1050 and recorded what she saw in a diary that survives to this day.
At the 2014 Quidditch World Cup final, members of Dumbledore's Army, namely Harry Potter, Ron Weasley, Hermione Granger, Ginny Weasley, Neville Longbottom, Hannah Abbott, and Luna Lovegood, were in attendance along with some family members.