Originally Posted by daimonos
but supposedly high school is "the best years of our lives"
I would say that's only true for people that don't go to college.
Although, even college is not necessarily the best years of your life. I party just as much now (mid 20's) as I did in college, but now I have a job that I semi-enjoy (as opposed to classes which I hated) and I actually have money (unlike in college when I was constantly broke).
Regarding your prom, I would look at it like this. If you want to go to your prom, then go. If you don't, then don't. I wouldn't even consider the concert as part of your decision. IF for whatever reason you decide you don't want to go to prom, then go to the concert since you just so happen to be free that night.