Okay, here's some literature then...
PRCA Rodeo Events Rodeo Events Explained
Pole Bending is not a main event for rodeo. You can do it in such like high school rodeo, but not PRCA. It is the same as barrel racing but a different pattern. Fastest time wins.
No rodeo event is cruel to animals, but that is an argument long worn out and exhausting to me...You could search the forum here to see it again.