Bun Bang Fai

The Bun Bang Fai Rocket Festival of Chiang Mai is an important local event held each year in June. During the festival, locals follow the tradition of giving water offerings to various Buddha images found in the temples throughout northern Thailand in hopes that it would bring rainfall during the wet season.

Three days of water offerings conclude with the festival, which is known locally as Bun Bang Fai.

source: https://www.chiangmaitravelhub.com/events/bun-bang-fai/