Here you have yet another photo of the Mystery Clown... I don't know the Clown drawing the caricature (can HE be another Mystery Clown?) but the two other Clowns are the Georgetti Bros.
Looks like a Shriners' Circus, don't you think?. By the way, the previous photo was taken in 1949, so that can give you an idea about the age of the photo you posted in your blog...
Marcelo PEPPO Melison
The clown at the easle drawing the caricature looks like Sa-So, which would most likely make this the Hamid-Morton Shrine Circus.