Look at the following: The fifteenth day of the seventh lunar month is called "Orchid Festival", also called "Mid-Autumn Festival". In some places, it is usually called "Ghost Festival" and "Stone Drum", also known as the Day of the Dead and the Half Moon Festival.
"Ghost Festival", commonly known as "July and a half" (13th or 14th in some areas). It is said that the dead ancestors were released by Yan for half a month at the beginning of July, so there is a custom of receiving their ancestors at the beginning of July and seeing them off at the end of July. When I sent it to my ancestors, I burned a lot of paper money for "ancestors to enjoy". At the same time, put the money paper in a paper envelope with the owner's name written on it and burn it at the time of sacrifice. This is the so-called "burning bag". Burn new bags that died within the year, and burn old bags that died more than one year.
I found another reason. Forty-five years is a turning point from prosperity to decline, so I said everything.
The reference is as follows: "Generally speaking, July 14 is the day when the gates of hell are wide open, so few people go out at night. This is just a one-sided idea. In fact, the ghost gate was opened and closed before midnight on July 14, that is, before July 15 12. According to ancient records, this time should be the deadline for ghosts to return to the underworld. "