September 9 of the lunar calendar is the traditional Double Ninth Festival. The Double Ninth Festival is also known as "Double Ninth Festival" and "old people's Day". Because the ancient book of changes set "six" as the Yin number and "Nine" as the Yang number. On September 9, the sun and moon are both Yang and the two and nine are heavy, so it is called Double Ninth Festival, also known as Double Ninth Festival. The ancients thought it was an auspicious day worthy of celebration and began to celebrate this festival very early. The Double Ninth Festival, because it is homonymous with "Jiujiu", is the largest number in the number and has the meaning of long life. Moreover, autumn is also the golden season of harvest in a year. The Double Ninth Festival has far-reaching implications. People have always had special feelings for this festival.