I've never been on my birthday. I'm not a big birthday celebrator myself, but I usually end up doing something with family that day. I have had a couple of OTC girls come over for my birthday and bake me a cake, then ask for my assistance with removing frosting they "accidentally" got on themselves in some very suspicious places. But never on my actual birthday I don't think.
I've gone with a group of friends for others birthdays quite a few times though. None of us are the type who like lots of attention, so we usually pass on the offers from the club to do things like bring the birthday boy on stage or any of that shit. We usually end up all buying the birthday boy a couple dances each. Sometimes they'll all be with one particular stripper he's enamored with, other times we end up buying dances for him from girls we like.
And I've stopped in for dancer birthday parties a few times. For a few faves I brought in gifts, for one girl in particular she had a thing for cupcakes so I brought in a bunch from a nearby bakery she liked. As I said earlier, I'm not much for drawing attention to myself, so I usually skip any sort of fuss they make over the girl and just sit back. Sometimes I'll do a longer room than usual or just give her a tip without doing the room.