The Natchitoches Humane Society and the Natchitoches Farmers Market present a Halloween Costume Contest for pets and children this Saturday, Oct. 26 during the market on the downtown riverbank. Registration will be held from 8-10 am at the Riverbank Stage. There is no fee to enter. Judging begins at 10:30 am. There will be prizes for first, second and third place in both the pets and kids contests.