There are two types of Halloween parades; a day parade and a night parade. I'd prefer to have a night time Halloween parade, held the Saturday night prior to Halloween (not to interfere with trick or treat night on Halloween).
Locally, Little Five Points has a daytime Halloween parade:
One can only imagine the entries in a Dunwoody Halloween parade. Lots of themes to go on. We can have DJ Vermack on a float, mixing Halloween songs and Michael Jackson's Thriller. A group from the DPT can dress up as the Farm House, the BicycleJoe Spandex crowd can do their thing, Farmer Bob can put on his overalls and lead a group of pigs down Dunwoody Parkway, the chicken posse can pull a wheeled chicken coop, someone can dress as the antebellum chimney (coming soon to a Starbucks near you), the kids can dress like their favorite TV and political characters, and the adults can dress as NIMBY's.
I know all the organizations like the Chamber, CVB, Rotary, etc. would take part.
The DHA can get things started, and I officially nominate Heyward as the Halloween Parade Chairman. Honey Boo Boo can be parade marshal and toss out candies to the children of Dunwoody.