This image seems to be somewhat related to the one that Stuff From The Park had on July 12. See that yellow banner? Wish I could read it, I assume it says something about the Indian Village. It was relocated in 1956, and I suppose that the banner could have been the entrance to the dance cirle and various Indian living quarters.
I am also curious about the little construction wall in the foreground, what could that be for? The workmen just left their tools unattended, that would never happen these days!