Got some pitying looks when I mentioned I was going to a concert by myself but really, it's pretty great.
I don't have anyone close who likes the band as well, so I would be worrying if the other person is enjoying him/herself even a little bit. All. The. Time. And - dancing like no one is watching is waaay easier! Plus you don't need to put the experience into words at your way home, you can just enjoy the bliss.