What do Japanese people do on April Fools' Day? What are the creative ideas behind their celebrations?

On April Fools' Day, April 1st, more than 800 police officers from the Tokyo Metropolitan Police Department and volunteers held a street parade in Ikebukuro, a famous bustling commercial area and transportation hub in Tokyo. They walked through the busy streets of Ikebukuro with banners and slogans, calling for improvements in the local living environment, crackdown on street solicitation that has negative impacts, and regulation of illegal sex custom shops. Among their demands was for the government to regulate private single rooms operating under the guise of massage services, as well as obscene DVD stores.

On the 30th, the Ikebukuro Police Station of the Tokyo Metropolitan Police Department had arrested two people, including Gao Feng Hai (39 years old), a Chinese national and manager of a custom shop, on suspicion of violating the "Custom Business Regulation Law" by illegally employing minors to work in custom shops. According to the police investigation, Gao Feng Hai and others were suspected of hiring three female middle school students (aged 15) who were under 18 years old as employees on the 25th, and allowing them to receive customers at a custom shop located in the Toshima Ward of Tokyo.

Isn't it rare for the police to hold a parade?