Explore Waterloo and Mill Street Treasures are hosting a sidewalk sale event in downtown Waterloo this Saturday, Oct. 10, from 9 a.m. to 3 p.m. Participating merchants are Bloomin’ Diehl’s, Bountiful Blossoms, Chantilly Corner, The Clothes Line Boutique, Farm Girl Finds, Mill Street Treasures, Small Town Style and Waterloo Mercantile Co. For more information, email…