Haha!  Been there...."butt" DIDN'T do that.  When our kids were elementary age, my wife and I would be more like the grandparents in the story.  Come early, then find a good seat in the front.  I would speak up if someone tried to stand in front.  That actually had that happen only one time when this father tried to set-up his tripod in front of us.  I just told him, "How do you expect US to see?"  He just gave me a really stink eye, but moved.  I prefer to SEE the performance live, and Lee is right.  You might watch the video one time, but rarely ever again.  And trust me, when your kids are teenagers, they don't want to watch it either.