I've shared a few large group photos here in the past.
This group photo of the St. Louis Post Office Inspectors and Office Force from 1935 came with a caption identifying everyone, which I transcribed here. Both of my maternal grandparents are in the photo.
The images can be enlarged, or one can follow the link for an ever larger look. Everyone was given a piece of paper with a number on it to hold, and the caption below identifies everyone by number. Unfortunately, #83, "E. Van Every," didn't make certain the piece of paper was visible to the camera, so I am uncertain who showed up to represent the Van Every family.
Either the caption is in error, and it should read "M.E. Van Every" for my great grandfather, Melvin Elijah. Or his fourteen year old daughter, Evelyn/Evva, represented the family. There are some young women in the photo, so it's possible. I've sent the photograph to some cousins, but haven't yet received any positive or negative identification. I do have a photograph of Melvin, shown below with his wife, Margaret. I don't see a clear match for him in the group above.