Short answers, pulled from the story.
The earliest definitive evidence for Dionysus worship comes from clay tablets unearthed at Pylos in the twelfth or thirteenth century BC. This Mycenaean Greek form appears twice on fragments, yet scholars cannot verify if it represents a true deity name due to the damaged state of the artifacts.
The Rural Dionysia began in Attica during the winter month of Poseideon, likely around 500 BC or earlier. A later festival known as the City Dionysia emerged in urban centers like Athens and Eleusis during the sixth century BC, while the Anthesteria spanned three days starting on the eleventh of the month when wine vats were opened.
Orpheus is said to have invented the mysteries of Dionysus according to Pseudo-Apollodorus. In the Orphic tradition, the first Dionysus was the son of Zeus and Persephone who was dismembered by Titans before being reborn.
In 186 BC, the Senate issued an edict banning former cult organizations due to their subversive nature. Of the 7,000 arrested individuals, most faced execution under the Senatus consultum de Bacchanalibus.
Herodotus recorded that Dionysus-Osiris existed as a single deity known since the fifth century BC. Plutarch stated anyone familiar with secret rituals would recognize obvious parallels between dismembering myths of both gods.
The Quinisext Council in Constantinople warned Christians against rural worship of Dionysus in 692 AD. Canon 62 prohibited public dances of women, ritual cross-dressing, wearing masks, and invoking Bacchus during wine pressing.