Tracing someone who travelled with Carnivals & Circuses in America

[George]

I have recently discovered that someone I have been researching travelled throughout America with various Carnivals and Circuses, he was last heard of in Ada, Oklahoma in 1935 aged at that time about 44, his name was Charles Russell Hetherington but he also used the aliases of Russell Charles Hetherington & Carl Hetherington, he was born in Norwood, Canada so could potentially have returned to Canada too.

Does anyone have any tips as to how I can trace him?

I have tried Wikipedia but the section on Carnivals, Circuses etc only covers those in the UK, at least as far as I can see.

George