Grand Buddhist ritual.
The lunar seventh month is known as the Ghost Month, where the spirits come to visit the living.
At the beginning of the lunar seventh month, the gates of the underworld open and the spirits come to visit the living, on the full moon day the spirits return to the underworld.
A Chinese Buddhist festival on the day of the festival of All Souls, on the full moon day of the 7th month, in order to release the souls of the deceased from purgatory, a concept that is at odds with pure Buddhism. It is also celebrated by Daoists.