Who are the immortals worshipped on the fifteenth day of the first month?

Zigu is also called Gucci, and in the north she is called toilet aunt and pit aunt. The ancient folk custom is to offer sacrifices to Ce Shen Zigu on the 15th day of the first month, and to offer sacrifices to silkworm and mulberry, which shows many things. Legend has it that Zi Guyuan was a concubine and was envied by her eldest daughter. On the fifteenth day of the first month, he was killed in the toilet and turned into Ce Shen. On the night of welcoming the daughter-in-law, people tie the portrait of the daughter-in-law with straw and cloth, and greet her in the toilet with pigsty at night. This custom is popular in the north and south, and it was recorded as early as the Northern and Southern Dynasties.

According to the folk custom in China, on the evening of the 15th day of the first month, every household lights lanterns to celebrate and enjoy the feast.