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The human person experiences, since adolescence, a period of singularity which permits, by recusing truths and principles of the “grown-up world”, to better appropriate and integrate them. But for this opposition to make sense and to permit to “make society”, on one hand the youth must be structurally able to negotiate his being and social duty, and on the other hand, the “grown-up world” must be ready and attentive to this necessary negotiation, to this necessary exchange between generations. The “techno party” phenomenon is a most fruitful model for broadening these hypotheses, because it shows on one hand a strong “singularisation” of young populations, and, on the other hand, a difficulty of the “grown-up world” to regulate and order these festive practices who can be held legally but have become increasingly clandestine.