It was, to what I've unearthed, a tent tour. Similar to the Kenley circuit (although he had Mrs. Roper, Audra Lindley), however I've never found which one.
I'd hazard it was either the Music Fair Tent Circuit, or one that Ruta Lee calls the Eastern Silo circuit (which I have never heard of).
The recording of her is quite good, although I like Loudon better.
http://www.youtube.com/huskcharmer