Join Councilmember Gabrielle Cahill's Barktober Dog Costume Parade and dress your pups in their Halloween best for an afternoon of costumes, treats, and tail-wagging fun. Contest categories include Cutest Costume, Spookiest Costume, and Best Pet/Owner Combo. Online registration is required by October 17, or onsite registration is available from 10:30 to 11:30 a.m. with proof of rabies shot and license.