Bribe them, not with the full price of the ticket, but with funny things that you can probably get away with not actually doing later. Haha. Say "I'll give you back rubs while you study", "I'll buy you McDonald's for lunch for a week", "you don't have to thank me when you fall in love with the band/artist". Pair a few of those up with some real reasons, for example "have a break from exam stress for one night", "I promise you'll have fun", "you'll want/deserve a break off studying". And if you're feeling brave, throw in "you actually need breaks and sleep in between studying for your brain to full organize information, this concert is the perfect opportunity". If they get really annoyed, or tell you no properly, then just leave them be. If you can, see if you can find not a stranger but someone outside of your circle of friends to go too. There may already be people in your grade going and you can just tag along with them. If you really exhaust everything and can't get a buddy, you'll just have to accept that missing this concert isn't the end of the world and that there will be others. I hope this helps. Good luck. x