Quote Originally Posted by Enkidoh View Post
Probably because it's an event based on a distinctly US celebration not really followed in any other country other than local shops trying to make money from kids weaned on too much imported US pop culture (I'm Australian and here Halloween is regarded as "that crass American holiday" to put it politely and ignored by the majority of the population)

You have to remember that this is an international game that is to appeal to just not US players but players around the world.
Halloween is from Celtic Europe. I don't know about the other countries with Celtic history but I can tell you Halloween has always been celebrated in Ireland, even long before the USA adopted it. I know that presently Ireland and the UK celebrate it. I frequently hear about other countries around the world who have also taken it into their own culture and celebrate it too.