Why is there a holiday in Hong Kong on May 5-5, but not in Chinese mainland? What does it mean to write long summer on 5-5 on the calendar?

The seventh of the twenty-four solar terms begins in April of the lunar calendar and around May 6 of the solar calendar, when the sun reaches 45 degrees of the yellow meridian. Folk customs regard it as the beginning of summer. At this time, the climate in most parts of China is warm and the crops grow vigorously, so the cotton and other crops are managed by intertillage. Agricultural proverb: "Three dynasties and long summers hoe the ground everywhere." And get a year's wealth by setting a sunny summer day. There is an agricultural proverb, "It doesn't rain in the long summer, and the plows and rakes hang high". The old customs make summer a traditional folk festival, which is called "Long Summer Festival". In ancient times, Emperor Tiandi led hundreds of officials to welcome summer in the southern suburbs and held ceremonies to worship Emperor Yan and Zhu Rong. It was not until the Ming Dynasty that people began to taste new customs. In the Qing dynasty, there were more customs such as offering sacrifices to gods, tasting new products, giving gifts, weighing people and making new tea. Up to now, Jiangsu and Zhejiang still have the dietary customs of "eating tonic food" such as eating long summer eggs, healthy bamboo shoots, five tigers Dan and three and a half; In Xuanwei, Yunnan, there is a gate with acacia branches and safflower to suppress sacrifices, and the walls are surrounded by ashes to avoid snakes. Some ethnic minorities in China also have the custom of having a long summer festival.