According to its official website, the heavy involvement of Maury County in the mule industry caused the event to grow for a time into "one of the largest livestock markets in the world.
"[2] In 1933, Thomas Marion Brown had the idea for a Mule Day Parade and Celebration as a way to bring in money to the community.
Mule Day suddenly gained wider notice in 2006 when the Mule Day Parade listing in the National Asset Database, a Department of Homeland Security (DHS) list of potential terrorism targets, was featured in a New York Times article.
Mule Day celebrations include square dances, mule-driving contests, horse shows, crafts festivals, and flea markets.
Food served at the event includes barbecue, roasted corn, home-made pies and funnel cakes.