I don't go to many concerts but every concert I've been too I wore diapers and glad I did because wearing diapers meant I didn't have to leave the concert to use the restroom.
I could just pee in my diaper and even poop in the diaper when I needed too and go on about my day at the concert and not miss a thing.
Diapers are great and the best underwear.
I no longer use the toilet and haven't used a toilet in nearly 7 years now as I wear diapers full time for both pee and poop.
Diapers are my toilet now and I will wear diapers for the toilet the rest of my life.
Everywhere I go I'm wearing diapers and even poop my diapers in public and then change later.
I also wear adult diapers on road trips so I can just pee and poop without stopping to use the potty.