SusanBeth:
I worked last year as an assistant to the Graduation Officer at the College I work for. What a job!!! I had no idea what was involved in a graduation ceremony.
As someone said, they will tell you at the grad. Believe me the moment will go by so quickly you won't even remember worrying about it.
As part of my job, I had to field all the calls from the graduating students. I even had someone call me and ask what colors to decorate their grad party to match their gown! And what shoes should they wear?
Good luck!