It reminds me somewhat if one can use their imagination, of the album cover for the Beatles' famous Sgt Peppers Lonely Hearts Club Band. It almost looks like some of the photos were pasted in, as in the album cover.
Hopefully some of the activities of the day created some happiness, as the participants do not look like they are having a great time.
With appreciation to Miriam Brunn Matranga for providing this photo, and to Stuart Matranga for scanning it.