The Jewish Cemetery in Prague. The doorways between the living and the dead were thought to open on the Celtic feast of Samhain.
“Winter is coming!” Samhain, the Celtic festival more commonly known as “Hallowe’en,” was considered the first day of winter in the Middle Ages and Renaissance. Marking the day halfway between the autumnal equinox and the Winter Solstice, Samhain marked the beginning of the sun’s descent into darkness and the world’s embrace by the growing cold. Both these trends would be reversed at the Winter Solstice, marking the “midpoint” of the Winter season.
Like Beltane, on April 30-May 1, Samhain was seen as a time when the ‘door’ to the Otherworld opened enough for the souls of the dead, and other beings such as fairies, to come into our world. The souls of the dead were said to revisit their homes on Samhain. Lewis Spence described it as a “feast of the dead” and “festival of the fairies”. However, harmful spirits and fairies were also thought to be active at Samhain. People took steps to allay or ward-off these harmful spirits/fairies, which is thought to have influenced today’s Halloween customs. The practice of lighting bonfires during Hallowmas may have been a Christianized one, as the Celts lit bonfires during Samhain as well.
I am currently working on a novel set in Ireland, Earth to Earth, Ashes to Ashes, that picks up on loose ends from Part 2 of the Come Hell or High Water trilogy. Earth to Earth involves the Celtic goddesses of battle and death, mortals from this world abducted to the Otherworld, and the Celtic holidays of Samhain and Imbolc or Ostara.