The eighth day of April is the Christmas of Sakyamuni Buddha, and April 28th is the Christmas of the King of Medicine and Bodhisattva. Only April 18th has nothing to do with Buddhist buddhas and bodhisattvas. In the folk, it is generally believed that April 18 is the day to open the temple gate. But this has nothing to do with Buddhism. If it matters, it can only be said that April 18 is one of the ten fasting days in Buddhism. The first, eighth, fourteenth, fifteenth, eighteenth, twenty-third, twenty-fourth, twenty-eighth, twenty-ninth and thirtieth days of each month are the ten days of lent. Therefore, April 18th is also one of the Lenten Days.