Wan Awk Pansa (วันออกพรรษา) means the day of leaving the rains retreat. It is a public holiday in Thailand, held on the fifteenth, or full moon day, of the eleventh lunar month.
The end of the Buddhist Lent. Monks are allowed to go out of temples, and people gather to bring them offerings of robes and food, in a ceremony called Thot Kathin, which lasts one month.