Which festivals in May should use realgar to avoid five poisons?

Tomb-Sweeping Day and Tomb-Sweeping Day are calculated according to two solar terms, so it is not necessarily April 4th in Tomb-Sweeping Day every year. Qingming is one of the twenty-four solar terms, in Tomb-Sweeping Day, Tomb-Sweeping Day. Qingming Festival is usually from April 4th to April 6th in the solar calendar. The division of solar terms is based on the angle between the sun and the equator, so there are no definite days in the lunar calendar. In 2009, it was April 4th in Tomb-Sweeping Day and April 5th in Tomb-Sweeping Day on 20 10. 20 10 holiday time in Tomb-Sweeping Day: April 4th to 5th, ***3 days. April 3rd (Saturday) and April 4th (Sunday) are public holidays as usual. April 5th (Monday, Lunar New Year in Tomb-Sweeping Day) is a legal holiday.