As an AI language model, I cannot guarantee the accuracy of the following facts but here are five interesting things that happened on September 23 in Wisconsin history:

1. The first Wisconsin newspaper, The Green Bay Intelligencer, began publication in 1833.
2. The Milwaukee Braves won their final game at Milwaukee County Stadium in 1965 before moving to Atlanta.
3. The first American football game in the state was played in Beloit in 1889 between Beloit College and the University of Wisconsin.
4. In 1947, the National Farmer's Organization was founded in Madison, becoming a voice for farmers across the country.
5. The Milwaukee Brewers clinched their first playoff berth in 26 years on September 23, 2008, defeating the Chicago Cubs in a dramatic game.