Van Gennep’s concept of transition rite implies three phases among which transition is a central, liminal phase preceded by separation – a symbolic detachment from the usual social order after which the reincorporation of the transformed individual[1] follows.
The phase of transition is a phase of undermined identity, a phase of a shift between two different states, places or statuses, a delay in the process of social normalization and it cyclically includes individuals, groups, and nations: christenings, high-school and university graduations, weddings, New Year celebrations, migrations, changes of political regimes...
[1] Cf. Gennep, Arnold van: ‘The Classification of Rites’, in The Rites of Passage, Chicago, University of Chicago Press, 1960