It part of the business. I used to shoot for a university and we always
had to do what was termed shake and grin shoots all the time. It is not
creative. It just part of the job.
For each picture don't let the people disperse until
they pass around a clipboard putting there name of a clip board preferable in
the exact order and row they are in. Tell them you need to get the spelling of
their names correct and tell them to stand there until the lip board has been
signed.
For fifty people you will probably be doing smaller groups
so make sure you get the clip board pages numbered. Also if possible get the
head of the group to check the names /pictures before you had in the final
piece.
Roy
