Every year, the people of Thailand celebrate a vegetarian festival. This Thailand festival begins on the 15th day of the waning of the 10th month of the Thai lunar calendar. This can occur during the months of September or October in any given year. Many Thai people observe this vegetarian festival, even if they do not eat Thai vegetarian food throughout the rest of the year. The festival is popular throughout Thailand, and especially in areas with large populations of Chinese immigrants, such as Bangkok, Chiang Mai, and Phuket.