April 4th, 20021year. According to the calendar information, Tomb-Sweeping Day in 20021year is April 4th, and the lunar calendar is February 23rd, so Tomb-Sweeping Day in 20021year is April 4th, 20021year. Tomb-Sweeping Day, also known as Walking Festival, Walking Festival, March Festival, ancestor worship festival, etc., is celebrated at the turn of mid-spring and late spring. Tomb-Sweeping Day originated from the ancestor belief and spring worship custom of early humans, and is the most grand ancestor worship festival of the Chinese nation.