it is known as Samhain. it is when the space between our world and the spirit world is the thinnest. (you can reach spirits much easier)
Halloween is a combination of pagan holidays, Sambain and Pomono.
Halloween originated as a pagan festival known as All Hallow's Eve.
Halloween started in Irland as a pagan holiday ,so it is celtic.
Samhain
Samhain is the Pagan Holiday that either occurs on the same day as Halloween (Oct. 31) or the day therafter (Nov. 1) or both.
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Halloween is traced back to Ireland. That's where it is supposed to have begun. In ancient Ireland, Samhain was a pagan festival and Halloween is supposed to have originated from this festival.
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Most likely Pagan. Search All Hallows Eve in a search engine.
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In many pagan traditions, Halloween is celebrated as Samhain, a Celtic fire festival which marked the end of the year and was also a time when spirits freely roamed the earth.
Halloween - is a Pagan festival - with its roots in Celtic history - nothing to do with ancient Greece.