While doing some research for the museum, I came across this gem from the November 1, 1894 edition of the Nanaimo Free Press. As far as I know, this may be the earliest mention of the word Halloween in the paper:
The youthful gang of hoodlums, whose unhallowed sport made Hallow’en anything but pleasant for their victims, had better take their warning, the only one that will be given, if they are desirous of keeping out of jail. To take away property of any kind so as to deprive the owner of its use, is an indictable offence…