Conversation so far:
Where is the Houston Livestock Show and Rodeo located?
The Houston Livestock Show and Rodeo has been held at NRG Stadium in Houston, Texas, since 2003.
How long does the Houston Livestock Show and Rodeo last?
The Houston Livestock Show and Rodeo is 20 days long.

Question: How many people participate in the rodeo?
Self-contained rewrite: How many people participate in the Houston Livestock Show and Rodeo?