I was at a graduation last year. A group of people would cheer, yell, blow plastic trumpets, compressed air horns, and throw confetti and glitter for several minutes whenever one of their group walked on stage. It was very disruptive.
Now in this scheme, the family of the kid walking has to pay, right? So that policy will end quickly when the group I mentioned above goes bonkers with noise whenever someone NOT of their group walks.
I misunderstood, apparently the family members who do the yelling get fined.