Agrionia
Agrionia was an ancient Greek religious festival in honor of Dionysus Agrionius. It was celebrated annually, especially at Orchomenus in Boeotia.
According to Plutarch, agrionia was celebrated at night with only women accompanied by the priests of Dionysus, who often wore black garments. Women pretended to search for Dionysos and then declared that he has fled to the Muses and hidden there. After that they feasted and begun to present and solve riddles.