I don't know how to provide an internet link, but there are several sites out there. Here's an excerpt from one:
"We like the pace a bit slower in these parts. Unless, of course, you happen to be here during the "World Famous Miles City Bucking Horse Sale." Always the third weekend in May, this event - dubbed the "Cowboy Mardis Gras" - consists of three days of broncs being ridden and auctioned off, plus street dances in the "people corral" on Main Street and other western activities. Miles City's population of about 8,500 easily doubles with visitors from the states and abroad."
Believe me, for us it's big time. Those years it doesn't snow or rain that weekend are the best. And I'm telling you Andy, with only 3 jeans days a year it's pretty exciting when they come around!