I assume you mean the mule day in Columbia Tennessee?
Columbia was known as the mule capital of the world due to its large mule auctions, but never recovered after the stockyard fire in March of 1952 that killed several hundred mules. This was the time when tractors were gaining in popularity, and although the stockyard was rebuilt, it was, and is, not anywhere near a large as it once was as the glory days are but an asterisk in history. There was an article in the herald of yesteryear about the stockyard fire last year but I can't seem to find it.
Mule day commentates those days of old...
I was born there and have attended many of the events over the years. I no longer live there and didn't attend this year......my sources tell me it was as big as ever and much fun was had by all.
Mule Day events sprint to finish | Columbia Daily Herald