As in all things, I blame Facebook.
It's one think to take your kid out to dinner or something for their last day of school. "yay, school's out, let's get pizza". But when you start advertising it, you only encourage the inherent competitive drive of Facebook Parent to one up. "Oh look, MaxPowerrr took his kids out for ice cream after their last day of school, well ol' UCL took his kids out for frozen yogurt and mix-ins... ON A BLIMP!" This leads to groups getting together and making big productions out of the mundane.
Meanwhile some magnificent bastard is making a killing off it all. If I could do it all over again, I'd skip law school and start up "MaxPowerrr's Travel Sports Teams and Elementary School Graduation, Inc.".