The goddess Bona Dea also had a May festival, which is better known. The winter festival was held in December, at the home of the current senior annual Roman magistrate cum imperio, whether consul or praetor. It was hosted by the magistrate’s wife and attended by respectable matrons of the Roman elite. This winter festival is not marked on any known religious calendar but was dedicated to the public interest and supervised by the Vestals, and therefore must be considered official.
Men were not allowed to know Her name, never mind speak it, and they were also forbidden from Her secret festival. There were other taboos concerning the worship of the Bona Dea: neither wine nor myrtle were to be mentioned by name during Her secret festival, likely because they were both sacred to Her and therefore very powerful.
Shortly after 62 BC, Cicero presents it as one of very few lawful nocturnal festivals allowed to women, privileged to those of aristocratic class, and coeval with Rome’s earliest history.
The Winter festival is known primarily through Cicero’s account, supplemented by later Roman authors. First, the house was ritually cleansed of all male persons and presences, even male animals and male portraiture. Then the magistrate’s wife and her assistants made bowers of vine-leaves, and decorated the house’s banqueting hall with “all manner of growing and blooming plants” except for myrtle, whose presence and naming were expressly forbidden.
A banquet table was prepared, with a couch (pulvinar) for the goddess and the image of a snake. The Vestals brought Bona Dea’s cult image from her temple and laid it upon her couch, as an honored guest. The goddess’ meal was prepared: the entrails of a sow, sacrificed to her on behalf of the Roman people, and a libation of sacrificial wine.
The festival continued through the night, a women-only banquet with female musicians, fun and games, and wine; the last was euphemistically referred to as “milk”, and its container as a “honey jar”. The rites sanctified the temporary removal of customary constraints imposed on Roman women of all classes by Roman tradition, and underlined the pure and lawful sexual potency of virgins and matrons in a context that excluded any reference to male persons or creatures, male lust or seduction.
According to Cicero, any man who caught even a glimpse of the rites could be punished by blinding. Later Roman writers assume that apart from their different dates and locations, Bona Dea’s December and May 1 festivals were essentially the same.