Eumysia
Eumysia is an ancient Athenian festival, specifically a type of harvest festival. It was celebrated in honor of Demeter and Persephone, the goddesses of agriculture and the underworld, respectively. The Eumysia was typically held in the autumn, following the gathering of the crops.
The festival was characterized by its emphasis on thanksgiving for a successful harvest and prayers for continued prosperity in the coming year. While specific details about the rituals performed at the Eumysia are limited and fragmented in surviving historical accounts, it is generally understood to have involved processions, sacrifices (likely of animals), and possibly dramatic performances or other forms of entertainment. The focus remained on the bounty of the earth and the goddesses' roles in ensuring its fertility.
Our understanding of the Eumysia is pieced together from scattered references in ancient literature and inscriptions. As such, the exact nature and significance of the festival are subject to scholarly interpretation and debate.