Conversation so far:
What are trail rides in the Houston Livestock Show and Rodeo event?
The trail rides range in size from a dozen to over one thousand people who ride on horseback or in horse-drawn wagons from various areas of the state to Houston.
Are the trail rides which are done prior to the Houston Livestock Show and Rodeo open to the public?

Question: Do people ride on horses?
Self-contained rewrite: Do people ride on horses in the Houston Livestock Show and Rodeo trail rides?