A brief history of Ruigoord: originally Ruigoord was a small island, later it got connected to the main land by poldering. In the early 70s, Amsterdam wanted to expand their harbour to compete with Rotterdam, and Ruigoord would have to disappear for that. Many of the inhabitants of the small village were bought out, but had to stay in the houses until the demolition, to prevent squatting. The pastor of the church was disgruntled by the affair and had decided to give the key to the church to some artists from Amsterdam who were active in the Provo-movement. Around the same time a church in Amsterdam had been squatted and became Paradiso, nowadays one of the main Dutch pop music venues in Amsterdam. In summer 1973 when the artists got handed the key to the church a few days before the demolition crew would arrive, many of the village inhabitants that were bought out took their suitcases and left, leaving their front doors open and quickly more artist friends got invited and while a few of the original villagers stayed, including a lady who ran the small village shop, the now empty houses all got squatted, and when the demolition crew was about to come, even more friends came and formed a protecting circle around the village, and when the demolishers arrived they just turned around and left. For decades the expansion of the harbour was halted with countless court procedures, finally the expansion of the harbour did take place, but while the area outside the village was dug out, the village itself and the church can stay for the time being (in March this year it was decided for the coming 25 years) as Artists' Freespace, with studio's and as event-/festival-location.
For detailed history/information, see Wikipedia - Ruigoord
An idea that you also find at Rainbow Family Gatherings and I guess Greatful Dead concerts, is that everyone is in some way a participant and co-creator of a gesamt-kunstwerk, a communal work of art, where everybody contributes their talents and energy to the happening. Those do have common roots in the Beats, the hippy and post-hippie movements and the psychedelic revolution. There are also connections to similar places/groups like Christiania in Denmark.