I believe the rodeo counts heads in the boats, so probably much less boats in the rodeo than the number 38 seems to indicate, probably more like 12 boats.
Correct me if I am wrong.
I have fished a lot of catfish events. Most are about 8-14 boats in the legit catfishing tournaments with hard core catfishermen. I fished the Classic on Santee in 2005 and there were 148 boats. It was a well run and organized tournament.