I was smart enough to contact the arena ahead of time to find out what their camera policy was. In this arena, they do not permit "professional cameras." They define that as any camera with a detachable lens. I get that. All it take is one numbskull to bring a huge 600mm lens and bop people in the head. If you shoot events like this, also note they will NOT allow tripods or monopods.
This kind of even is exactly why I have a second camera. My first camera is the Canon 5D Mark IV. My second camera is the Canon 3Gx with a built in lens that zooms to 600mm. Now, it will never replace my main camera. For one thing, it can't take rapid fire shots for action sports. But it does save photos in raw format and gives me about every other freedom in options.
I shot all of these with a wide open aperture of f/2.8 and an ISO of 3200. Post processing mostly with Adobe Lightroom.
(Cave Creek Rodeo, then Country Thunder)