Chuseok is a major mid-autumn harvest festival and a three-day holiday in South Korea celebrated on the 15th day of the 8th month of the lunar calendar on the full moon. It is also known as Korean Thanksgiving Day. The holiday period actually lasts for three days in total – including the day before and after Chuseok. Koreans return to their ancestral hometowns to celebrate with their families, causing one of the biggest traffic jams of the year as people often take to the road to reach the provinces outside of Seoul. During Chuseok, people celebrate their ancestors, show their gratitude to them, and spend time with their families. Traditionally, Koreans perform ancestral worship rituals early in the morning and visit the tombs of their immediate ancestors to trim plants, clean the area around the tomb, and offer food, drink, and crops to their ancestors. Koreans celebrate Chuseok by making special foods, particularly a certain kind of rice cake called songpyeon. Chuseok is a time for family gatherings, sharing food, and playing games with loved ones. It is a celebration of a good harvest and a hope that the coming year will be better than the previous.