Hmm well I've done the Freebird one at a pub in Thailand once where a shitty cover band were playing, they launched into it and it was the only song they played well all night, was epic ha ha!
And I think I usually wear a different t-shirt at a show but sometimes not, I don't know, don't have a t-shirt of every band i go and see. What concerns me more are the campaigners in front of you that film entire shows on their phones which means you can't see, ****ing annoying and rude!