This weekend is the start of the Chrysanthemum Festival (대한민국 국향대전) in Hampyeong county, which also hosts the Butterfly Festival each spring. I saw some brochures for this a few weeks ago and it looks absolutely gorgeous. Take a look at some photos from this blog, from whence I stole the above photo, or run a Naver search for more. It starts on Wednesday the 29th and runs through November 23rd.
Also the start of the Bay Reed Festival (순천만갈대축제), which actually will start on Tuesday and will go to November 4th. Held at Suncheon Bay, accessible via city bus 67. I wrote a little about it for the Korea Times a few days ago, so have a look at that
In an example of ridiculous overlap, in Suncheon there's also the Namdo Culture Festival (남도문화제), held at Palma Stadium (팔마체육관) from Wednesday the 29th through Friday, a little bit down the street from Homever. It will feature traditional performances and games from the province's cities and counties. You can find some pictures and stuff from years past via a Naver search; the festival seems pretty sparsely attended. Maybe because it's held during school days.