I've lived here for 20 years, and this is the one "local" idiocy I have fought with fervor all that time. Halloween is October 31. Period.
I'll do you one better. Where I live (Taylorville, IL) the town geniuses have declared Holloween to be observed on TWO nights (30th and 31st). Boy, isn't that special? Now I get to worry about vandalism and keeping pets indoors for TWO nights instead of one.