Google Korea(Google.co.kr) celebrates Chuseok celebrations October 3rd, 2006 with a special logo showing a dancing group.
Chuseok, also sometimes spelt ‘Chusok’, is a major traditional holiday in Korea, celebrated on the 15th day of the 8th lunar month of the year. It is a thanksgiving feast and is also called Harvest Day, Harvest Moon Festival, or Hankawi. Read more about Chuseok at Wikipedia.
