I have not attended a graduation since my brother's h.s. graduation which was fairly decent except for when they called the very popular guy's name who was also a member of a family whose every kid graduated from there (and yes ALL HIS FAMILY WAS THERE), we joked that they prob rented a charter bus to get his family to attend
My h.s. graduation was horrible in regards to families acting a fool, YES there were alot of air horns...what is worse is when my friend went up to walk, security took away the air horn from the family who kept using it, horrible timing cause right after they mentioned her name the IGNANT folks started booing to no end so it seemed as if she was getting booed
There was also this one girl...who nobody could stand cause she was just so LOUD and IGNANT, her fam was worse...you couldn't hear the three names after her

Not to mention the graduating gangsters who threw up their signs AS THEY WALKED!!
I agree they should have a policy similar to this one, I think it creates some order, though I know the student cannot control how their folks react, so maybe they should eject the family after their kids name is called? I know when i graduate I want my family to represent though they know how to act! Well most do...I'll keep that crazy aunt away from the ceremony to make the fam look good