BoostBear
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What came to mind thinking back on that paper I wrote about 2 decades ago was; Day of the dead in Mexico, Devil's Day, Pagans & Stonehenge Sacrificials, Lord of Halloween, and something with the need of Warding off Evil spirits that came out at that time.It’s of Celtic origin, you might have confused it with the Mexican Day of the Dead starting on the 1st Nov: Samhain - Wikipedia
Lots of influences from Dia de Muertos on modern Halloween though.
So.. I had some key thoughts but not much else lol