Coming of Age Day is held on the second Monday of January each year. It’s a special event to congratulate all Japanese teens who have reached the age of majority, which is 20 in Japan, over the past year. Harajuku’s Meiji Jingu Shrine is one of the most popular places to visit during this event and will be completely packed!
You can find Meiji Jingu just a short walk from Harajuku Station. Entree is free and there are no closing days.
Meiji Jingu Official (English) website: http://www.meijijingu.or.jp/english/