Good point. The idiotic herd needs visible activity for awareness and mass entertainment news publishes the sensational, exciting, horrifying, tragic, humorous. Day of the Hessian would have to compete with minority/gay oppression, Christian evangelicals, road side bombs and beheadings.
My thought was Halloween or Winter Solstice for several reasons, mainly heritage, cultural and theatrical. The days correspond with "bad" in the Christian reality bubble. I'm fairly certain Nov. 1 is witchcraft's most important day and Oct 31 is of course Halloween/Samhain, which has been defiled like Yule - cheesy, plastic junk, moron tunes and all that grief-slop our pig-herd public enjoys.