I could understand it if people were actually required to relinquish their phones (the concern about losing it, and whatnot), but honestly, if one can't put their phone away for two or three hours at a concert or a movie, they shouldn't go to concerts or movies. And if you're holding it up to take pictures or video, it could just as easily get jostled out of your hand and get lost somewhere on the floor anyways.
Go to the concert, put it in the Yondr pouch set to Vibrate, and tell the babysitter or your friends to only call in an absolute emergency. If it buzzes, head to the concourse, get the pouch unlocked, and call them back. I honestly don't know how anyone can hear anything on their phone in a loud concert setting anyways. I struggle to hear the person next to me, even when they're yelling in my ear.
Edited by J.C., 25 January 2018 - 03:26 PM.