This bit is from Chuck Plahniuk's Rant:
Dr. Christopher Bing, Ph.D.: Generally speaking, liminal versus liminoid is defined as follows. The term "liminal" refers to a ritual that marks passage from one phase of life to the next: a baptism, a graduation, a honeymoon. In contrast, a typical "liminoid" event such as a rock concert, a rave, or a plyamorous consensual group sex party occurs outside of the mainstream, but a liminoid event marks no such life transition. The defining characteristic of the liminoid space is that all participants are equals. Social or caste rankings are discarded, and all present enjoy an egalitarian mutual affection for one another. Turner's name for this spontaneous solidarity and love was the Latin word "communitas."
Dr. Christopher Bing, Ph.D.: At its worst, the liminal or liminoid event functions as a release for accumulated anxiety, thereby protecting the overall civilization. At its best, liminal and liminoid spaces become social laboratories wherein participants can experiment and develop new forms of self-expression and social structure.