Pretty cool theme right?
Anyways besides that here's what halloween is.
Hal·low·een [ˌhaləʊˈiːn]
noun
Halloween (noun)
the night of 31 October, the eve of All Saints' Day, often celebrated by children dressing up in frightening masks and costumes. Halloween is thought to be associated with the Celtic festival Samhain, when ghosts and spirits were believed to be abroad:
"our favourite thing about Halloween is dressing up" "a Halloween party"