Rocket festival or “Boon Bang Fai” in Thai is usually held in the second week of May of each year, at the beginning of the rainy season. The farmers are ready to cultivate their paddy fields. The festival is popularly celebrated in the northeastern provinces of Yasothorn and Ubon Ratchathani. The celebration is an entreaty to the rain god for plentiful rains during the coming rice planting season.
The festival itself owes its beginning to a legend that a rain god named Vassakan was known for his fascination of being worshipped with fire. To receive plentiful rains for rice cultivation, the farmers send the hope-made rockets to the heaven where the god resided. The festival has been carried out till these days.