Keeping them from participating in graduation ceremonies is just wrong IMO. Think of all the work they put in and their parents put in to get them to that point. This is definitely not ok after 13+ years of work to graduate. My kids aren't geniuses. They work hard to get the grades they get. I would be raising hell if they were denied graduation ceremonies over a dance video, no matter how provocative anyone might think it is.
High Priestess JessMess, follower of the Goddess of the Coiling Way and Confiscator of Concoctions in the Order of the Curly Crusaders