In both the ancient city of Ayutthaya and in Bangkok, the 8th International Thai Martial Arts Festival and Congress, Mar 17-24, celebrates Nai Khanom Tom Day, a day to commemorate the man who invented traditional Thai boxing. A week of events includes the country’s largest wai kru (a ceremony paying homage to teachers), several Thai boxing matches and other Thai martial arts showcases. See the entire program at www.muaythaifestival.com.