Interesting stuff, however Messiah was crucified on the 14 of Nisan, not the 15th, as all Passover lambs were. He had to be removed from the cross before the 15th, which began the Feast of Unleavened Bread.
They also had rituals for marking the halfway point of each season.
Midway through winter they celebrated something called Imbolc. We call it Ground Hog Day.
In the spring, April 30 Was known as Beltane and also Walpurgisnacht.
Midway through summer, it was called Lammas and midway through Autumn it was called Samhain, now known as Hallowe'en.
They're only points in the ever changing seasons.
I guess any culture can make out of them whatever it will.
But as long as the kids just try to extort candy from me, I'm not going to give it any further thought.
If they start to demand a blood sacrifice from me for Satan, that's something else again.
Their are, currently,too many real devils to contend with. They take the form of lawyers, judges, and politicians.