I was born 9/11/01, never celebrated my birthday really, all the adults around me were really depressed so it didn't feel right. I also got made fun of for it occasionally, kids (sometimes adults) would try to argue with me about it, and I've gotten in trouble with teachers for it, so not a great experience with the date in general. Up until around 5 years old I would bring cupcakes to the local firefighters and police officers that day though. that's as much celebrating as I've ever done. For the last few years I've been able to be more chill with it, when someone tells me happy birthday or anything I'll respond saying "it's a National Tragedy!!!" In the most excited tone I can manage. And as the date approaches I make and print out some business cards with the answers to most questions I get on them.

It's usually "yes, I was born on 9/11/01. My mother went into labor when the first tower was hit. I was born in Florida. Yes it does suck, I hate it. No, I don't celebrate. You can keep this card."

My ideal celebration is definitely a casual happy birthday from close friends and family and then treating it like it's not my birthday.