Halloween is on the eve of a Christian feast of All Hallows' Day
I'm sure God is well pleased with this...:-)...
Halloween, or Hallowe'en (/ˌhæləˈwiːn,
-oʊˈiːn, ˌhɑːl-/; a contraction of "All Hallows' Evening"), also known
as Allhalloween, All Hallows' Eve, or All Saints' Eve, is a yearly
celebration observed in a number of countries on 31 October, the eve of
the Western Christian feast of All Hallows' Day
Study God's wrath this Halloween:
http://www.desiringgod.org/articles/five-truths-about-the-wrath-of-god