If you're old enough to be kicked out of the house, why are you still asking your parents for permission to go to concerts?
I've been following the thread though, and I think I can provide some kind of explanation. In short, I think you should go to the show, but listen to your parents.
There's a reason why your parents are acting this way, and I'm not sure you're telling us that part of it. From my own experiences I'm guessing, like my parents, yours want you to get a job.
You're 18, graduating high school, etc. You're basically at that point in your life where, unless you're going away to university and/or working full time, your parents are going to start scratching their heads when they look at you. If you're spending money while you don't have a job, or while they're scrambling to make that first university payment, they're probably going to be even more annoyed.
Basically, your dad is right.
Right now you should either be a.) working to help pay for the looming tuition bills or b.) working and saving up so you can eventually get a better job, move out, etc. If you're doing either of those things, who cares if you make a little extra and want to go to a concert? You shouldn't even have to ask permission. But something tells me that since your mom thinks you "always" asking for things you're not in the habit of working for the things you have. If that's true, then yeah, I can see where your parents are coming from. The sooner you get in the habit of changing that the better-- especially if you plan on living with your rents for a couple more years.
So listen to your dad. Time to grow up, be responsible, make your own decisions (and be able to pay for them on your own; not because you got 5 bank cards in the mail). Sorry if that sounds a little harsh.