What festival is April Festival?

The festival in April is Tomb-Sweeping Day.

Tomb-Sweeping Day is one of the traditional festivals in China, and it is also an important sacrificial festival. Every year at the beginning of the third lunar month, when the sun reaches 15 degrees, it is Tomb-Sweeping Day Qi. Tomb-Sweeping Day usually falls on April 4th or 5th in the Gregorian calendar, so Tomb-Sweeping Day is also called "April Festival". Tomb-Sweeping Day Qi is the noumenon of Tomb-Sweeping Day, which originated in the Zhou Dynasty. There was a custom in the Zhou Dynasty called "outing".