What holiday is four days away?

Explanation of four-day absence: beginning of spring, Chang Xia, beginning of autumn and beginning of winter were called absent the day before, but they were called absent these four days.

Source: According to China's ancient theory of Yin-Yang and Five Elements, water (winter) died after the revival of spring in beginning of spring, and wood (spring) died in ChangXia Hou. When it gets cold in early autumn the day after tomorrow, the fire (summer) goes out, and when it gets cold in early winter the day after tomorrow, the gold (autumn) goes out. Therefore, the day before the establishment of the four pillars is called four days. On this day, don't travel, don't take a job, don't get married, don't move in, and don't hold a city ticket festival. The four-day break introduces the vernal equinox, autumnal equinox, summer solstice and winter solstice among the 24 solar terms in four seasons every year, and the previous day is a four-day break. Four days away from the sun, ten days in a quarter, the ancients concluded that it was unlucky; Among the 24 solar terms of the four seasons, the day before beginning of spring, Changxia, beginning of autumn and beginning of winter is the four seasons. Four parting is the beginning of four seasons, and four unique seasons are the end of four seasons. The ancients were afraid of exhaustion and decided it was unlucky.