What is the custom of the eleventh day of the first month

Son-in-law Day<br/ The eleventh day of the first month is the "son-in-law day", a day when the father-in-law invites his son-in-law to dinner. In addition to the food left over from the celebration of Tian Gong's birthday on the ninth day of the first month, there is still a lot of food left over from the first ten days of the first month, so the mother's family does not have to spend any more money, so they will utilize this leftover food to entertain their son-in-laws and their daughters, which is referred to as the "eleventh day of the month son-in-law day" in the folk song.

In fact, the "son-in-law day" is very historical, in ancient times, the first nine days of the first month to celebrate the birthday of the "Duke of Heaven" left over food has not been eaten, and therefore will be used to worship the gods of food to entertain the daughter and son-in-law, as a daughter of the first two days of the daughter On the eleventh day of the first month, the daughter's son-in-law will be treated to the food that has been sacrificed to the gods. The first day of the month 11, the daughter son-in-law rushed back to the mother's home must be the mother's brother or brother to go out in advance to meet, as a way to show the mother's family son-in-law's respect and attention.