The Cult of Death and the Maiden: Secret Rites of the Eleusinian Mysteries by Sculptor Eleanor Crook (Zoom)
Sculptor and “lapsed classicist” Eleanor Crook, explains in this lecture for Morbid Anatomy the Persephone myth and what is known about the Mystery Cults of Greek Antiquity.
It seems for one thing that the Greek ritual drink, the Kykeion, was a 'heady brew'. Clearly there are issues here for psychedelia researchers.
https://www.morbidanatomy.org/