Frenzied, orgiastic.
Example:
Only in the tropics did such festivals become truly Dionysian, he said, which was why he was booking his flight to Rio.
Dionysus was the Greek forerunner of Bacchus. He was the inventor of wine, the first intoxicant, which he gave to the human race. For that gift and for all the uninhibited behavior that it led to, Dionysus became immensely popular, and he appears in a great many myths. He is often shown with a wine goblet, his hair is full of vine leaves, and he is frequently attended by a band of goat-footed satyrs and wild female spirits called maenads. The Greek Dionysian worship began as solemn rituals but eventually became great celebrations with much drunken lewdness.