HARVEST FIESTA, Williamstown, 11 a.m.-3 p.m.: Williamstown Community Preschool is hosting its third annual Harvest Fiesta fundraiser at the preschool at 777 Main St. This event is open to all; admission is $5/person or $20/family. Williams College Students from the Ritmo Latino Organization will be leading two Latin Dance lessons at noon and 1 p.m. In addition to music and dancing there will be authentic food, a spooky bake sale, hay discovery center, obstacle courses in our gym, a pumpkin ring toss, face painting, cookie decorating, crafts and more. Costumes welcome.