Try to relax, and enjoy his company without worrying about the end of the evening. If he does look like he's about to move in for a full-on kiss, and you're not feeling ready for that step, simply give him a quick, friendly kiss on his cheek, tell him you've really enjoyed the evening and hope you can do something else together again very soon. Chances are he's probably worrying himself about how he should say goodbye at the end the evening. If you really like him, I'd probably be totally honest with him and say it's been a long time since you've enjoyed a man's company, and you don't want to rush things and end up ruining something that could be good ... "Let's enjoy getting to know each other properly, and see where it leads". If he's a decent guy, and wanting the same thing, he will appreciate your honesty. Good luck, and enjoy the concert!