Despite the hot weather in the ancient town of Lamphun, a large crowd of Buddhist votaries gathered at the foot of Tha Nang Bridge to welcome the annual Klong Luang (Lanna-style big drum) contest back after a two-year hiatus as part of the seven-day Phra That Hariphunchai Bathing Festival to mark Visakha Bucha Day.
Source : https://www.bangkokpost.com/travel/2316122/bang-the-drum-slowly
