Canyon County breaks ground on new expo hall Commissioners held a groundbreaking ceremony Wednesday morning for the new facility which is expected to open by November 2022. Author: KTVB Staff Updated: 5:57 PM MDT July 28, 2021 CALDWELL, Idaho — The Canyon County Fair is getting a new Expo Building. Commissioners held a groundbreaking ceremony for the new facility on Wednesday morning. Representatives from Boise-based HC Company, the Caldwell City Council, Caldwell Urban Renewal District and Fair Director Diana Sinner were on hand to officially kick-off the construction project. Construction of the 45,000 square-foot building is expected to be completed by November 2022. Once completed, the Fair Expo Building will be the newest addition to the Canyon County Fairgrounds and the Caldwell Events Center. This partnership includes the Fair, City of Caldwell events, Caldwell Night Rodeo, Simplot Stadium events, and the College of Idaho.