As stated on the website:

Built with the joint input of growers, vintners and allied industry members, the Unified Wine & Grape Symposium is held annually in Sacramento, California and is the largest event of its kind in the western hemisphere. Serving as a clearinghouse for practical information important to wine and grape industry professionals, the Unified Symposium also hosts a trade show with over 650 suppliers displaying their products and services to the more than 12,400 people who attend annually.