"The Bacchanalia (or Bacchanal / Carnival) were Roman festivals of Bacchus based on various ecstatic elements of the Greek Dionysia. They seem to have been popular ...
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and well-organised throughout the central and southern Italian peninsula. They were almost certainly associated with RomeĀ“s native cult Liberalia which is dedicated to Liber and spouse Libera, also known as Proserpina. The cult probably arrived in Rome itself around 200 BC. However, like all Greco-Roman mysteries very little is known of their rites. Once the Bacchanalia had become popular, the Roman Senate considered them a threat, believing it was designed to rebel against their political views, thus they wanted to suppress the mystery cult to avoid any kind of rebellion against the Senate." - (en.wikipedia.org 14.07.2021)