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A Japanese woman wearing a kimono makes a V sign while she checks her make-up during the Coming of Age Day celebration ceremony at an amusement park in Tokyo, Japan January 9, 2017.
REUTERS / Kim Kyung-Hoon

The INSIDER Summary:

• On the second Monday of January, a bizarre rite of passage for newly classed adults that have turned 20 in the last year takes place.
• I n Japan, 20 is the legal age for drinking, smoking, and voting.
• Since most attendants are drinking for the first time, the event gets pretty rowdy.

LONDON — Every year, on the second Monday of January, young Japanese men and women don colorful kimonos and hakama to take part in "Seijin no Hi," or "Coming of Age Day," celebrations.

The event is a rite of passage for newly-classed adults that have turned 20 in the last year. In Japan, 20 is the legal age for drinking, smoking, and voting.

The get-ups are fabulous — reminiscent of Royal Ascot attire in Britain, including the iconically voluminous women's hats.

With attendants drinking legally for the first time, Coming of Age Day is normally a pretty raucous affair — police scuffled with revelers in Okinawa this year.

Scroll down for a rare look into one of Japan's most garish festivals.

Welcome to Seijin no Hi, or 'Coming of Age Day.' Grab your brightest kimono, longest eyelashes, and a bottle of something strong and take a look inside.

Dressed in Japanese kimonos, a group of Japanese youths who will turn 20 this year, the traditional age of adulthood in Japan, get on a vehicle of a bear after a Coming of Age ceremony at Toshimaen amusement park on the national holiday in Tokyo, Monday, Jan. 9, 2017.
AP Photo / Shizuo Kambayashi

Historically, youths that took part in the Coming of Age ceremonies were of noble descent. Dating back to the eighth century, children were not officially gendered until after the rite of passage, then known as Genpuku.

Japanese women wearing kimonos pose for their memorial photo after their Coming of Age Day celebration ceremony at an amusement park in Tokyo, Japan January 9, 2017.
REUTERS / Kim Kyung-Hoon

Traditional ceremony dictates that male adolescents have their hair cut to identify their gender and they can choose an adult name. Now, the occasion is marked rather differently.

Attendants hang around before their Coming of Age Day celebration ceremony at an amusement park in Tokyo, Japan January 9, 2017.
REUTERS / Kim Kyung-Hoon

Source: "The Red Thread: Buddhist Approaches to Sexuality", Bernard Faure.

A speech is usually given by a local government official, after which the festivities can commence.

Young Japanese man and woman, who'll be 20 years old this year, are all dressed in Japanese kimono and dance with Mickey and Minnie Mouse, and other Disney characters on stage during a coming-of-age ceremony at Tokyo Disneyland in Urayasu, near Tokyo, Monday, Jan. 9, 2017.
AP Photo / Koji Sasahara

"I’m happy I can finally drink alcohol and go clubbing," one college girl attending the ceremony told AFP. Today, the ceremony seems to revolve as much around drunken debauchery as it does around a symbolic milestone.

Dressed in Japanese kimonos, a group of Japanese youths who will turn 20 this year, the traditional age of adulthood in Japan, get on a merry-go-round after a Coming of Age ceremony at Toshimaen amusement park on the national holiday in Tokyo, Monday, Jan. 9, 2017.
AP Photo / Shizuo Kambayashi

Source: Japan Today.

It's also about the outfits. Some women book appointments at beauty parlors a year in advance in anticipation of the annual inundation. By 5 a.m., 500 young women have arrived at Sugano Ogimi's photo studio, beauty parlor and formal wear shop in Okinawa — "It's like in a war," she says.

HIMEJI, JAPAN - JANUARY 13: 20 years old woman waits make-up for her 'Coming-of-Age Day' celebration at Hair Sakura beauty parlorl on January 13, 2014 in Himeji, Japan. The Coming of Age Day is a Japanese holiday to congratulate and encourage young people who have reached the age 20 as maturity in Japan, when they are legally permitted to smoke, drink alcohol and vote.
Buddhika Weerasinghe / Stringer / Getty

Source: The Japan Times.

Many Japanese people are concerned with the level of degradation in today's Coming of Age ceremonies, irked by young women wearing looser fitting kimonos similar to the style of 'oiran,' the high-class prostitutes of the Edo Period.

A Japanese woman wearing a kimono makes a V sign while she checks her make-up during the Coming of Age Day celebration ceremony at an amusement park in Tokyo, Japan January 9, 2017.
REUTERS / Kim Kyung-Hoon

The southern city of Kitakyushu launched a website last year urging new men and women to dress appropriately for Seijin no Hi. "The coming-of-age ceremony is supposed to be a serious event where you demonstrate your recognition that you have become an independent adult," said a city official.

Japanese women wearing kimonos take a 'selfie' after their Coming of Age Day celebration ceremony at an amusement park in Tokyo, Japan January 9, 2017.
REUTERS / Kim Kyung-Hoon

Source: The Japan Times.

The message doesn't seem to have been widely received — revelers in Okinawa this year scuffled with police as their cars were seized for dangerous driving.

apanese women wearing kimonos ride a roller coaster during their Coming of Age Day celebration ceremony at an amusement park in Tokyo, Japan January 9, 2017.
REUTERS / Kim Kyung-Hoon

Source: Russia Today.

It's also hard to reflect your imminent ascent to the adult world while simultaneously reaching for another selfie with Mickey Mouse.

Disney character Mickey celebrates with Young Japanese peoples, who'll be 20 years old this year during a coming-of-age ceremony at Tokyo Disneyland in Urayasu, near Tokyo, Monday, Jan. 9, 2017.
AP Photo / Koji Sasahara

The day of celebration bears a dark reminder, however, of Japan's shrinking population. This year, just 1.2 million people became new adults compared to 1970's peak of 2.46 million.

A Japanese woman wearing a kimono gets on a train after the Coming of Age Day celebration ceremony in Tokyo, Japan January 9, 2017.
REUTERS / Kim Kyung-Hoon

Source: Japan Today.

Read the original article on Business Insider UK. Copyright 2017. Follow Business Insider UK on Twitter.

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Step inside the bizarre Japanese 'Coming of Age' ceremony - featuring lots of booze and Mickey Mouse

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On the second Monday of January, a bizarre rite of passage for newly classed adults that have turned 20 in the last year takes place.* I n Japan, 20 is the legal age for drinking, smoking, and voting.* Since most attendants are drinking for the first time, the event gets pretty rowdy.