The Pure Brightness Day in the third lunar month, one of the 24 Seasonal Division Points, is also an ancient traditional festival in China. People have the custom to sweep graves, offer sacrifices to ancestors, take an outing in the countryside and wear a willow twig on the head. Every family goes to the countryside for a memorial ceremony at their ancestors' tombs. People remove weeds around the tomb, add new earth, burn incense and offer food and paper coins to show their remembrance and respect for their ancestors. This is called "visiting a grave" or "sweeping a grave". At this time, the grass is burgeoning, willows along rivers have put forth new buds; it is fresh green everywhere, a good time for an outing. In ancient times, people used to wear a willow twig in their hair at this time because it was supposed to be able to drive away ghosts and disasters. Thus, people wear willow twigs to pray for safety and happiness.