Silver Spurs Rodeo is mentioned in this thread:
http://www.orlando-guide.info/forums/topic_13727.asp
but I think it is only held twice a year. I think there may be another rodeo held in Kissimmee but it is not professional like the Silver Spurs one.

If you have not yet been I would highly recommend Cirque de Soleil at Downtown Disney, buy your tickets from the link at the top of this page.

Karen