Well he has no responsibilities. His entire calendar is free, for the past two decades. They came out 17 years ago. He can go get one and learn how to use it.
I have absolutely no sympathy for people who choose not to get with the times. We all took our time to learn how to use a smartphone. He could have too but chose not to. Probably refused to learn to use tap to pay, ATMs, etc as well. You chose to opt out of society. You are no longer part of it.
(I’m not happy that you need an app to buy tickets, but that’s a different thing — he didn’t choose not to own a smartphone out of principle)
Kind of you to volunteer his time.