Northern (now on) to Loy krathong festival called as "Yi Peng" which means the merit for the full month (if the month counts as Lanna twelve months corresponds to the Thai style) by the popular Northern unfounded fabrication.
Northern (upper) Loy referred to as "Yi Peng" which means moon merit in twenty months. (I counted over twenty months to match the twelfth month in Thailand) would be appreciated by the inventor over unfounded.
The northern (upper) are called loy "illuminating" which means paying in full moon brand (brand if counted by the Lanna will match the twelve months in Thai). The northerners are popular artificial lanterns.