Rituals as part of the Ghost Month.
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.
Some say this is to commemorate the dead when a whole village was buried in a landslide. Apparently a lot of beggars congregate for the festival.