The 15th day of the 7th lunar month is known as the Ghost Festival. Its origin dates back to the story of Maudgalyayana rescuing his mother, which was first recorded in the Ullambana Sutra.
Maudgalyayana was one of Buddha’s ten most outstanding disciples, and he also had the greatest psychic powers. After he acquired psychic powers, the first thing he did was to look for his mother, who had passed on.
