I'd be much more interested in rodeos if they had scientists riding gigantic amoebas and shit. And the announcers would give mini-lessons about the particular amoeba/virus/bacterium/protozoan/whatever they're riding.
"Whoa, it looks like Dr Stephenson there is riding in on Giardia lamblia!"
"You betcha, Chad! It looks like its little wiggly cilia are trying to strangle the good doctor!"