Having begun way back in the early 1950's, I can't think of how to improve on this historic rodeo - it's got everything (mutton busting, bulls, barrels, clowns, fair, food, parade, queen, etc.) A real, crazy, small town event with some big-time national performers. Not too big, not too small. The Mexican cowboys (charros) are a awesome addition. We go every year we can (6x so far).
As this is held during the rainy season, be prepared.
Also, you may eat some mud if you sit on front row seats (join the local crowd in the grandstands).
Don't forget your camera.