Loi Krathong (known locally as Yi Peng), held on the full moon of the 12th month of the traditional Thai lunar calendar. Every year thousands of people assemble floating banana-leaf containers (krathong) decorated with flowers and candles and deposit them on the waterways of the city in worship of the Goddess of Water. Lanna-style sky lanterns (khom fai or kom loi), These sky lanterns are believed to help rid the locals of troubles and are also used to decorate houses and streets.