Still, WHY would they bother photographing a fairly minor occasion like that? Well, because it wasn't May Day, it was the priests' ORDINATION Day, a much bigger occasion in a Catholic family's life. (This photo would have been about 1912 or so).
The occasion below is much later--1937, I think. We don't know who the bride was, or the flower girls, but the new priest is Fridolin Mischke. His brother Benno is the tall one on the left.
Edit: From a description of an ordination in June, 1926, the girl in the middle was the "bride" and carried a wreath of flowers on an embroidered pillow. The two others were "flowergirls". They were part of a procession to the church and probably participated somehow in the service.
MUCH later: The two Crosier priests and two Benedictine nuns were all children of John MISCHKE and Theresa PESCHEL, four of eleven kids in that family. We figured out who they were and wrote more about them in January, 2012. (Yeah, sometimes it takes awhile ☺)