Why burn paper in July and a half?

The Mid-Autumn Festival on the 15th day of the seventh lunar month (in some places, especially in the south of China, it is July 14th. Legend has it that at the end of the Northern Song Dynasty, Mongols invaded a certain place, and residents celebrated the festival one day in advance in order to escape. Taoism called it Mid-Autumn Festival, Buddhism called it Orchid Festival, and July and a half was Ghost Festival. The celebration of this festival begins on the first day of the seventh month of the lunar calendar and lasts for one month until July 30th. On the fifteenth day of the first month, Han people call it Shangyuan Festival to celebrate Yuanxiao, which has existed since ancient times. On July 15, the Han people called the Mid-Autumn Festival a festival to worship ancestors. 1October15th, the Han people call it the next yuan festival, which is a cold food to commemorate the sages. It is a traditional folk custom of the Han nationality to light river lanterns and pray for blessings by Taoist priests on the Mid-Yuan Festival. Buddhism and Taoism have different interpretations of the significance of this festival. Buddhism emphasizes filial piety. Taoism focuses on "Purdue" those lonely souls released from the underworld. The fifteenth day of the seventh lunar month is the Mid-Autumn Festival, just like the Shangyuan Festival on the fifteenth day of the first month and the Xiayuan Festival on the fifteenth day of October. Mid-Autumn Festival is a Taoist festival. Taoism believes that "Sanyuan" is another name for "Three Officials". Shangyuan Festival, also known as Shangyuan Tianguan Festival, is the birthday of Emperor Wei Zi blessed by Shangyuan. The Mid-Yuan Festival, also known as the Mid-Yuan Festival, is the birthday of Qing Xu, an official who pardoned evil in the mid-Yuan Dynasty. The next Yuan Festival, also known as "Xia Yuanshui's joint", is the birthday of Emperor Xia Yuanshui's Guandong Yin.