Okay, ladies tell me what you think..?

I've been talking to thiss girl for about two monhts. We're getting pretty serious about each other, but it's long distance, so we're not " official" yet. Well she's coming to see me this weekend, meet my parents, and then I'm going to meet hers. Were staying with each other two nights. Well, tonight, I was gonna take her to the field where we first felt that spark, and were gonna look at the stars.. well I was wanting to make it official, she's said that she thinks it will just happen, in a moment, like well both know it. Well she is a huge Skillet, ( christian rock band) fan, and I got us tickets for a month from now. She doesnt know. I was gonna say something like " So baby I have these concert tickets, and was thinking that they would make a good one month anniversary present."....So ladies..is that a good idea or bad?