Ah, jeollanam-do is very beautiful! That's the area I went to view cherry blossoms, I think!
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According to my friend who works in public school, public schools will get Sept. 6, 7, 8, 9, and 10th off, so if you want to go to Fukuoka for a concert, you should be able to! It's super cheap to get from Japan to Korea ($200 for round trip or so if you take Peach Airways).
Deodorant, and if you like a specific brand of toothpaste...you should bring that too XD
Most of the teachers I know have used Talk to me in Korean (http://www.talktomeinkorean.com/) to learn at least some Korean. It's a very user friendly, newbie friendly site.
Learning Hangul is also pretty easy. honestly, it shouldn't take more than a day or two to memorize all of them...
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For things to do in Korea,
http://english.visitkorea.or.kr/enu/SI/SI_EN_3_6.jsp is a good place to find festivals and such.
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