Hanging eggs is the custom of which festival?

Long summer is the seventh of the 24 solar terms and the first in summer. It marks the change of seasons and the official start of summer. On the day of long summer, people boil eggs, and in some places they even make eggs with tea leaves or walnut shells, which is called standing eggs. As the saying goes, there is an egg hanging on the chest in long summer, and the child is not in summer. In the early morning of long summer, the old people at home will put the cooked "long summer eggs" into woven red nets to feed each other, or hang them on the children's chests or on curtains.