Thousands of families in Qian Qian always change the fragrance of old symbols. What festival is it?

It refers to the Spring Festival. "In addition to firecrackers, the spring breeze warms Tu Su, and thousands of families always exchange new peaches for old ones." Wang Anshi's January Day. As can be seen from the previous two sentences, "one year is divided by firecrackers, and the spring breeze warms Tu Su", which means that it has been one year; Spring breeze only appears in spring, right? "Thousands of households always change new peaches for old peaches", and every family is red, always changing old couplets into new ones. "New peaches for old peaches" has become the same language to bid farewell to the old and welcome the new. Judging from various solar terms, it is around beginning of spring, and the only major festival in this period is the Spring Festival.