November 19, 1850
Preliminary steps were taken toward the formation of an agricultural society in Rock County, with a call made on farmers to meet at the Court House in Janesville.
The evidence
“The preliminary steps toward the formation of an Agricultural Society in Rock County were taken November 19, 1850, at which time a call was made on the farmers of the several towns of the county to meet at the Court House, in Janesville, on the first Monday of January (the 6th), "to make arrangements for their own benefit by association."”
1879-history-of-rock-county/12-rock-county-ch06-politics-war-record.md, PDF p. 443 / book p. 447
Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.
Grade A: Found on a page of one of our sources
“The preliminary steps toward the formation of an agricultural society in Rock county were taken November 19, 1850, at which time a call was made on the farmers of the several towns of the county to meet at the court house in Janesville on the first Monday of January, the 6th, to make aiTangements for their own benefit by association.”
1908-brown-rock-county/17-agriculture.md, Vol. 1, PDF p. 436 / book p. 403
Brown, William Fiske, editor. Rock County, Wisconsin: A New History of Its Cities, Villages, Towns, Citizens and Varied Interests, from the Earliest Times, Up to Date. Chicago: C. F. Cooper & Co., 1908. 2 vols. archive.org/details/rockcountywiscon01brow, archive.org/details/rockcountywiscon02brow.
Grade A: Found on a page of one of our sources · may repeat 1879-history-of-rock-county, so not counted as independent