09/12/1859 - 09/17/1859 The National Agricultural Society's annual fair opened on September 12 in Chicago, Illinois and ended on September 17, 1859. (By John Osborne) Source Citation The American Almanac and Repository of Useful Knowledge (Boston: Crosby, Nichols, Leeand Company, 1861), 403. Record Data Date Certainty Exact Type Business/Industry People Places Chicago, IL Images