Some parents didn't want their children photographed by other parents and one of the Christmas Plays our children were in.
Our school waited until the end of the play and then organized for all the children who's parents consented to pictures being taken to stand and have their photos taken - either alone or in groups (of Angels etc), still in costume and against background scenery etc. It worked very well and we got some beautiful pictures.
I assume the children who's parents who didn't want them photographed were ushered out of the hall before they realised that they were being treated differently? Otherwise that would open up a whole other can of worms . . . .