For Buddhists, the period from the full moon day of the 11th lunar month until the full moon day of the 12th lunar month marks the end of Vassa and the beginning of the Kathin, or pilgrimage season. This is a time when Buddhists make pilgrimages to various temples, bringing food and gifts—particularly new robes—to the monks. In Myanmar, Thadingyut is the day on which the Buddha completed his preaching of the Abhidhamma, or “philosophy.” In Laos, it is called Boun Ok Vatsa, or the Festival of the Waters, as it is a popular time for pirogue (canoe) races. Discuss
Source: The Free Dictionary