I recognize it was 1931, and at the Juab High auditorium, but not sure who the people on stage are.

I do recognize one person in the photo, but she graduated from Nephi High in 1928, and this shows a big block of J on it. It is just an assumption, but wondered if that was about the time that Nephi High became Juab High, and this is the Alumni of the LDS Seminary graduates. Your guess is as good as mine, neat to look at the old curtains. I counted thirty one people there; two with a genuine smile; fourteen with a smirk and two that a little bored to be back in school!