This thesis is the result of four years of investigation carried out as « security coordinator » of the Monteux Jazz Festival. From this operational commitment, I sought to understand : how the festival is integrated into the city ; what affects the safety of the public and disturbs the urban order ; the apparatus implemented for risk management. The analyses focus on two spatial figures: the club and the park. The first part retraces the difficult adoption of electronic music in the 1990s, before raising questions pertaining to the Strobe Klub in situ, in particular the conditions of production of clubbing - an experience now largely integrated into the regulated and profitable system of urban leisure. The second part focuses on the festive occupation of a public park located outside the perimeter of the event; from a night that degenerates between young people and the police, to the development and implementation of an urban mediation project. The results of this research allow to draw a sociological framework for the festive space by highlighting three urban security regimes (tension, domestication, taming) which correspond to specific ways of dealing with risk (fear, suspicion, relationship) and are part of a dialectic of outside/inside (exclusion, selection, inclusion). These are both personal and collective ways of engaging and experiencing disorder, of preparing spaces or implementing practices. The importance of social work in the management of large public events and other crowd moments also emerges. The «outside of any party» is not only a spatial outside, but the unpredictable part which, in the perspective of hospitality, allows us to reexamine urban security policies.