Susan Sember, President, and The Essential Image Source Foundation have been invited to participate in Vaquero Heritage Days in San Juan Bautista, CA, Aug. 20-21, 2010, as the Featured Artist. A sneak preview of clips from "The Gathering", which is the first of EISF's vaquero documentaries in "The Legacy of the California Vaquero" film project, will be shown at the Friday Evening Gala, followed by additional film previews at the Saturday Celebration.