Ireland
Halloween is very popular in Ireland (as it is one of the Celtic nations where the holiday originated) and is known in Irish as Oíche Shamhna (pronounced ee-hah how-nah), literally "Samhain Night." Pre-Christian Celts had an autumn festival, Samhain (pronounced /%u02C8s%u02E0aun%u02B2/from the Old Irish samain), "End of Summer," a pastoral and agricultural "fire festival" or feast, when the dead revisited the mortal world and large communal bonfires would hence be lit to ward off evil spirits.

HALLOWEEN
IS NOT SATAN'S BIRTHDAY

i wasnt saying it was, but for those who believe so, to still let their kids go trick or treating. i dont know enough about the history of it to have an opinion.