The Lake Mills Aztalan Historical Society is holding Aztalan Day at the Society's Museum site at N6284 County Q, Jefferson. Featuring Kurt Sampson, archeologist, who will give a lecture. There will be demos and displays, vendors and food. Adults $5, children 5 and under free, Seniors $3. For more information : lakemillsaztalanhistory.com or call (920)648-4632.