The festivals in April include April Fool's Day, Tomb-Sweeping Day, World Intellectual Property Day, Earth Day and World Health Day.

1. April Fool's Day falls on April 1st of the Gregorian calendar. On this day, people cheat and play tricks on each other in various ways, and it is often at the end of the joke that they expose and declare the teaser as a "fool". On April Fool's Day, jokes can only be played until 12 noon, which is a strict rule established by convention. The person who has fun after noon is a bigger fool than the person he makes fun of. People who joke after midnight will immediately find themselves in trouble.

2. Tomb-Sweeping Day is around April 5th of the Gregorian calendar, that is, the 15th day after the vernal equinox. Tomb-Sweeping Day is a traditional major spring festival. It is a fine tradition of the Chinese nation for thousands of years to pay homage to the graves and remember the ancestors. It is not only conducive to promoting filial piety and family memory, but also to promoting the cohesion and identity of family members and even the nation.

3. World Intellectual Property Day was established by the World Intellectual Property Organization on April 26th, 21, and it was decided to designate April 26th of each year as "World Intellectual Property Day" from 21, with the purpose of establishing worldwide awareness of respecting knowledge, advocating science and protecting intellectual property rights, and creating a legal environment to encourage knowledge innovation.

4. Earth Day, that is, April 22nd every year, is a festival specially set up for world environmental protection, aiming at raising people's awareness of existing environmental problems, mobilizing people to participate in the environmental protection movement, and improving the overall environment of the earth through a green and low-carbon life. Today, the celebration of Earth Day has developed to 192 countries around the world, and more than 1 billion people participate in it every year, making it the largest folk environmental protection festival in the world.

5. World Health Day is the day to commemorate the adoption of the organization's charter. In June 1948, the World Health Organization was formally established at the first World Health Assembly of the United Nations held in Geneva, and it was decided to designate April 7 every year as World Health Day, and countries were encouraged to hold various commemorative activities.

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