This is what you do:
1) Go with older friends, if possible, thereby being older by association and minimizing potential questioning. (Also, this is a good idea because going to shows with friends of any variety is good times.)
2) Go to the venue about 10 mins after they say doors open, having already bought tickets. The doorfolk will be swamped and will probably sweep you, and everyone else, in as quickly as possible to keep the folk in line happy and moving.
3) Bring a big black marker, and even if the venue's policy really ISN'T to let in any minors, beg them to let you in but with dignity. Explain as forcefully and as eloquently as possible that you just might die if you can't see Slint and thus they should let you in to avoid being liable for your demise. THEN, after promising that you won't sneak a drink, conveniently produce your black marker so they can x you up to reinforce that idea.
The first two steps have always worked for me, and I've had the black marker for the third but have never needed it.
Then again, I also had a fake id....and the age of majority here is 19....and I've looked about 23 since I was 15..........
Basically, good luck. If you are not a jerk and you don't sneak a drink it will all probably work out for you. One thing I don't suggest is sneaking in. I can't speak personally, but I have witnessed incidents...bouncers don't take kindly to that, and that could get you banned from the venue for varying lengths of time. So yeah.