I went to a rodeo in Wisconsin last year, tried shooting it with my 7D II and a 70-200 f2.8. Everything was o.k" for a while but they save the bull riding for last at these events and even at iso 10000 I was only getting 1/250 shutter speed and the photos were too noisy to work with. This year I took my 6D and shot at iso 12500 and although the noise was better there still was not enough shutter speed. You can't shoot to the right when there is hardly any light. I would say take what you can get from the beginning of the rodeo before it gets really dark or try to find a matinee. The one I went to was a professional rodeo and no strobes were allowed.