Halloween is a contraction for the words All Hallow's Eve, which is the Christianised name for Samhain Eve, the eve of the new year for the ancient Celts. Therefore November 1st is Samhain proper, or New Year's Day, which was renamed All Saints Day by the church.
Halloween, for the vast majority of people who observe it, is a secular occasion. (I hesitate to say holiday, because the word holiday, as in holy day, originally referred to days marking a religious event. So the expression "secular holiday" is actually an oxymoron.) Suffice it to say, very few people know or care about the historic, religious and cultural origins of Halloween, and yet more people than ever, of diverse religions and backgrounds, celebrate it every year.
When I was a child growing up in WASPy, newly-formed, open suburbs (it was a long time ago when there was some space between houses) nothing indicated that Halloween was happening until the very night, with a simple jack o' lantern placed on the porch to show that trick-or-treaters were welcome. Nowadays the decorations are often quite elaborate, and are put up weeks before the special night. I think that's okay. After all, what's wrong with erecting a pseudo-graveyard on the front lawn? Sure, it's silly, but it's fun, and could be construed as creative. Though it may be tacky, it's still someone expressing themselves. I don't see that as a problem. The same goes for all the costumes. I've observed people I usually consider dull and unimaginative don a mask or disguise of some sort and get into the spirit of things for just one giddy, raucous night of make-believe.

Samhain Eve, and its spring counterpart, May Eve (April 30), were the two nights of the Celtic calendar when the veil between the worlds was at its finest, allowing for spirits to pass freely between this world and the Otherworld. Hence the ghosts and goblins of Halloween, when the nights grow longer and colder. By contrast, May Eve is a time when spirits of a lighter, more benign nature roam around, although they are still capable of great mischief and mayhem. Spirits, whether light or dark, can trick or treat better than any mortal. It's this rich and magical folklore I see when I watch the secularized Samhain celebrations on city streets. Call me weird, but I much prefer large groups of people pretending to be scary and fierce to angry hordes engaged in street fights and riots. Halloween is a unifying occasion for the many cultures and faiths represented in large, multicultural cities. If it were seriously considered to be a religious holiday there wouldn't be the great numbers of revellers of diverse backgrounds dressing up and partying down.
Halloween is largely a North American festival, derived from the Samhain celebrations brought over by the early Irish and Scottish settlers. The carving of pumpkins to make jack o' lanterns is one of the most
ubiquitous and well-known of North American features of Halloween. And it's another way that regular folk can be creative and express themselves. So what if Halloween is a diluted, popularized vestige of its former, Old World self? That's what happens with time and adapting to a new land. It's called change, and it's a part of life.
Halloween is a festival where people spend creative energy in "pretending" and leaving their ordinary, everyday selves behind. For at least one night of the year they feel free to live in their imagination, and play like kids again. So let the nay-sayers scoff all they want; they're missing out on all the fun.
There are, however, and thanks be to Goddess, those who celebrate Halloween more seriously, by honouring the ancient, earth-based traditions of Samhain Eve. They are the folk who follow the Old Ways, and conjure Magic all year 'round. But present day Halloween is for everyone. It has become a night when even Muggles* can make Magic. And from what I've seen, they do, and have a blast doing it.
So mote it be.
-G.P.
* non-witches and wizards, and other magically-challenged folk - from Harry Potter and Co.