Grapes were greatly used during ancient Greece. On tombstone, sarcophagus decorations, indoor and outdoor decorations, coins. It was a commonly used symbol.
Dionysus:
Originally a god of the fertility of nature, associated with wild and ecstatic religious rites, in later traditions he is a god of wine who loosens inhibitions and inspires creativity in music and poetry.
Dionysus rites were generally held at night. Women would wear leather clothes, wreaths woven from ivy, they would drink wine, and they would dance wildly around Dionysus' statue. Sometimes they breastfeed
wolf cubs or fawns, sometimes they would hunt animals cut them up and eat the raw meat. From time to time, the women who got into a trance would smash a man or a child into pieces during the ritual. People who drank wine and danced wildly, enthusiastically felt they were as strong as the gods. Religious enthusiasm most of the time was even higher with sexual enthusiasm. The night went on in a frenzy and the attendees loosed self-control.
https://steemit.com/tr/@feryuse/mitoloji-dizisi-6-sarap-ve-eglence-tanrisi-dionysos-the-god-of-wine-and-entertaintment
The word "Orgies" (orgia, same radical as ergon, the work of art, is a plural word) designates all the actions played out during the Dionysian ceremonies. Dionysian ceremonies are based on the concept of 'outside the body' (the freedom of the initiate from the restraints of earthly matters to unite with the god through ecstasy) under the spell (katekhesthai) of music and dance, in the trance which seizes the maenads of the cortège as well as the women of Thebes on the Cithaeron of Delphes on the Parnassus (see Antigone's 4th stasimon). This trek in the mountains is called oreibasia (from oros, mountain and basis, the act of walking).
http://www.cndp.fr/archive-musagora/dionysos/dionysosen/attributs.htm
Because his stepmother Hera was tormenting him. His father Zeus turned him into a goat and his hair is usually shown as grapevine. Dionysus can also turn into a snake. "
Anthesteria" (festival of the dead) was one of the four Athenian festivals in honor of Dionysus.