Well, I'm from the era of the great Polaroid Instamatic. At registration, we were plopped in front of one for a headshot, which was then stapled to our regestration card.
You said this sorority claimed the photos were for their scrapbook, though, so I want to think they were candids. We did take pictures of our events, including Rush (as it was called back then), especially theme parties that involved a skit, costumes, etc. PNMs were often included in the pictures, but were not the main focus. Such photos would end up in an album that was sometimes brought out during parties for PNMs to look through to learn more about us and see our activities.
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