What should happen here?

Okay, so here's the situation.

My boyfriend has gotten into a new band called nonpoint. A band I had never heard of before and he loved them. So naturally I listened to them because he liked them and eventually I got into them too.

It just so happens that they are coming to town on the 12th with a few other bands I'd love to see. Jared has been talking about it for months now and I was very excited to see them.

Okay so here is where the situation twists

The venue the concert was originally playing at was all ages. The venue shut down at the last minute and the concert location changed. To a bar. 21 and up. I'm only 19. And cannot go any more. He and I bought the tickets a while ago. Of course I was a little disappointed. But I didn't want him to hold back on going. at first I asked for him to refund my ticket but then he suggested he would find someone to go with. He has been talking to a lot of people looking for someone to go with and talking about how great this show is going to be and now I'm really bummed out. And tried to talk to him and he says it's better he has someone in case something happens.

(Let me explain)

We went to a kmk concert a while back and while we were there an older woman with tight platinum blonde curls and a mouse sound voice tried to grab him and grind on to him in a lap dance type of motion. It wasn't just him it was everyone she could find. But I pulled him away and she tried to start shit with me before my boyfriend pulled me away.

I trust him to the fullest but I am really upset about this situation in general. What should I do here?