The origin of Tomb-Sweeping Day, also known as Qingming Festival, dates back to the Tang Dynasty. It is a traditional Chinese holiday to honor deceased ancestors and is celebrated on April 4 or 5 each year according to the lunar calendar. The red color symbolizes prosperity, happiness, and good fortune in Chinese culture. It is often used in decorations, offerings, and clothing during this festival to convey respect and reverence for the ancestors. In English, you can say:

"The origin of Qingming Festival dates back to the Tang Dynasty and is celebrated on the 4th or 5th of April according to the lunar calendar. The red color symbolizes prosperity and happiness in Chinese culture, often used in decorations, offerings, and attire to pay homage to ancestors."
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