Coming of Age Day or Seijin Shiki or 成人式 in Japan
Coming of Age Day or Seijin Shiki or 成人式 in Japan is held on January 11. Celebrated on the second Monday of January. This event in the second decade of the month January is annual. 
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“SEIJIN-no- hi,” Coming of Age Day, is a national Japanese holiday held on the second Monday of January to honor young adults who turned 20 years old over the past year. It is a way of welcoming them into society and is an essential rite of passage for the Japanese people. Festivities include coming of age ceremonies (成人式, seijin-shiki) held at local and prefectural offices, as well as after-parties among family and friends.
From April 1, 2022, Japan's age of the majority will change for the first time in more than 140 years, from age 20 to 18. However, anyone under 20-years old will still be banned from entering bars, buying cigarettes, booze and gambling.
Similar holidays and events, festivals and interesting facts
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Peculiar People Day on January 10
Bittersweet Chocolate Day on January 10
Learn Your Name in Morse Code Day on January 11
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Step in a Puddle and Splash Your Friends Day on January 11 (Jumping in puddles and splashing their friends - some find a reason to have fun);
Poetry At Work Day on January 12 (finding the beauty in your job and putting it into some form of artful prose);
Feast of Fabulous Wild Men Day on January 12
International Kiss A Ginger Day on January 12