I've worn mine to movies, a concert and a major-league sports event. OK, sometimes it's not really my diapers but instead a pair of thick adult-sized training pants with a few stuffers inside them and plastic pants--close enough.
The last time at the movies was in 2012 at the new Three Stooges movie. There's a scene where they end up in a hospital baby ward and have a “pee war” by picking up babies and aiming them at each other as they pee. Honest. I thought it was hilarious that I was sitting there watching this while peeing in my own pants. LOL.
Another time years before that I was at some movie, I was not in my diapers or training pants but had to pee--but didn't want to get up during the good part to go do this. It just got worse and worse until I thought “Oh, what the hell?” and let loose and completely soaked my pants. I then sat there in the wet seat for the rest of it. When it was over it was dark inside and out, I had on black shorts, nobody noticed. I now feel bad for the people that worked there and wonder if they had to in some way clean the seat? (I've always suspected that this is a common occurrence at theaters, and wondered if they notice and what they do.)
I've never pooped mine while doing this, that would be lots of fun but I'd have to be sure to go by myself and sit by myself so nobody else would have to be near me.
Another fun thing that I've often done is, after one of these events, on the way out, I'll take my time and eventually the ushers come in to guide the remaining people out of the venue. I've often asked the ushers--especially the ones who are women--"How long have you done this and what's the weirdest thing you've ever seen?" I've heard several stories of them coming in after teeny-bopper concerts by groups such as the Back Street Boys or whoever, and finding wet panties that excited girls apparently peed in then somehow managed to slip out of them and leave them there so they didn't have to go home that way.
There have also been many times when I've wanted to watch a fairly long movie--uninterrupted--at home so I put on my diapers, get all the drinks/beer I know I'll want, then sit here and watch it and yes, by the end of it I'm usually soaked and now have something else to enjoy. Wink wink.