Frenzied, orgiastic.
Example:
The bacchanalian partying on graduation night resulted in three wrecked cars, two lawsuits by unamused parents, and more new experiences than most of the participants could remember the next day.
The Roman god of drama, wine, and ecstacy, Bacchus was the focus of a widespread celebration, the Bacchanalia, at which there was wine in abundance and celebrants were expected to cut loose from normal restraints and give in to all sorts of wild desires. The festivities got so out of hand that in 186 B.C. the Roman authorities had them banned. Much the same bacchanalian spirit fills New Orleans' Mardi Gras carnival each year.