20200401 1st April=April Fools 'Day！
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1.April Fool's Day 愚人节：
April Fool's Day is also called All Fools'Day, Humor's Day and April Fool's Day. The Festival is on April 1 of the Gregorian calendar. It is a popular folk festival in the West since the 19th century. It has not been recognized as a statutory Festival by any country. On this day, people cheat and play tricks on each other in various ways, often at the end of the joke to expose and declare the target of the joke as "fool".
The nature of jokes seldom contains real malice, but individual jokes cause people's panic because they are too big, which generates a large-scale response and generates rumors and urban legends, so it is generally avoided for people to make jokes about disasters.
愚人节也称万愚节、幽默节，愚人节。节期为公历4月1日，是从19世纪开始在西方兴起流行的民间节日，并未被任何国家认定为法定节日。在这一天人们以各种方式互相欺骗和捉弄，往往在玩笑的最后才揭穿并宣告捉弄对象为“愚人”。
玩笑的性质极少包含实质恶意，但个别玩笑由于开得过大而引起人们的恐慌，从而产生较大规模反响并且衍生成为谣言和都市传说，所以对于人们来说一般会加以避免开如有关灾难之事的玩笑。