If everyone who'd been playing for 35 years went to Carnegie Hall, there'd be no room for you!.
Don't think about it too much, just enjoy it--by the way, I've seen a few things in Carnegie Hall, and I've listened to your MP3- and I think just you, banging away on your guitar, and singing, will be the best show of all. Don't forget to call the folks at the "Today Show", David Letterman, et al and tell them your story--they love to feature "Carnegie Hall" acts as guests, and they love guests who have unusual stories, they might even let you play your song--might as well, you're going to be in town anyway--