I am not overly looking forward to the SS parents and family members who seem to frequent the school programs this time of year. I go to my niece and nephew's programs, and the SS behavior is prevalent: parents who do not remove/quiet down noisy younger siblings and/or not keeping tabs on them, parents/other adults who hog the aisles when snapping pictures and/or capturing video, people who do not silence their electronics even though the musical director asks ahead of time and the program asks people to do so among other things.
At my DD's school (magnet for the arts, so these people should know better!) they had the amazing shrinking audience. The kids were supposed to go to the band room after their performance, and wait for the end before they left. Instead, as one group finished and another started, the parents of each group would, for the most part, sneak out the back (pretending to be quiet, but really not quiet at all). It got to the point that one teacher actually told the kids that if they weren't there at the end of the performance to pick up a 'ticket' saying they had stayed, they wouldn't get performance credit!
Always was a shame that the parents of the freshmen would sneak out at the beginning, and so have to only 'suffer' through their kid's first performance - and missed the actually quite good performances of the upper classes!