I've been wondering this for awhile now and tried looking up information with no luck. Does Knotts hire a third-party theater company for the casting of the Hanging show? If so, does anyone know of what company it is?
"If you can dream it, you can do it" - Walt Disney
No third party company. Auditions are held every August for the show. There are stunt auditions and acting auditions. They are both held at Knotts. The stunt coordinator works for Knotts at the Wild West Stunt Show.