In Korea universities hold fairs for student organizations to raise money. Usually in the fall, when the weather is still nice and warm, the university will shell out some cash to get an artist to come perform during the fair. If you pay careful attention you can see some awesome shows. The best thing is university students are usually too busy to turn up so you'll be guaranteed a good spot. I saw Jay Park and Beenzino, and the best part was that the only thing I paid for was my subway fare.