August, 31st to September 1st
The Hassakusai 八朔祭 ceremony is the day when all the Yamabushi practitioners who took part in the Autumn retreat (aki no mine iri 秋の峰入り) gather in Mt. Haguro. They engage in several rituals in front of the Hachiko shrine 蜂子神社, a shrine dedicated to the legendary prince Hachiko, who is said to be the founder of Mt. Haguro and Dewa Sanzan.
There are several rites involving purifying fire during that night, dedicated to the esoteric Buddhist god of fire Aguni. The fire burns humans' stains and sins away and makes them return to Mother Earth as ashes.
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