It may be of interest to note that the arapaho also made very large sun dance shelters.
"The Sun Dance of the Blackfoot Indians"
Clark Wissler
It was said that a few Blackfoot warriors once visited the arapaho at the time of their sun dance where they were put through the cutting ceremony.
"The Sun Dance of the Blackfoot Indians"
Clark Wissler
The arapaho, Cheyenne, Crow, Blackfoot, and other peoples of the Plains often crossed the range for purposes of hunting, warfare, and trade.
"Shoshone-Bannock Subsistence and Society"
Robert F. Murphy Yolanda Murphy