Hanging eggs is an activity of which solar term?

Hanging eggs is a traditional custom in long summer.

As the saying goes, "an egg hangs on the chest in the long summer, and the child is not in the summer." It means that as the temperature rises and summer approaches, children are particularly prone to "summer" symptoms. It is said that as long as they eat eggs in the long summer, they can prevent diseases. But for people now, the long summer is just a solar term, which means that spring has passed and summer begins now. However, ancient ancestors regarded the long summer as an important day. Old customs make summer a traditional folk festival, called "Long Summer Festival".