The Golden Potlatch festivals were held in 1911-1913 and commemorated the arrival of the first gold from Alaska. This image is signed, unlike many other Golden Potlatch photos.
We don't know the names of any of the women, or of the man in the background on the right.
There are four other images numbered 5:
Reuse of image numbers and different image series make it difficult to know how many images Otto published.