For more information on Seijin no hi, use these sites.
http://muza-chan.net/japan/index.php/blog/customs-traditions-seijin-no-hi
http://www.yamasa.org/acjs/network/english/newsletter/things_japanese_24.html
http://www.japantoday.com/category/national/view/coming-of-age-day-ceremonies-held-across-japan
http://www.japan-guide.com/e/e2280.html
http://web-japan.org/kidsweb/explore/calendar/january/seijinshiki.html
http://www.yamasa.org/acjs/network/english/newsletter/things_japanese_24.html
http://www.japantoday.com/category/national/view/coming-of-age-day-ceremonies-held-across-japan
http://www.japan-guide.com/e/e2280.html
http://web-japan.org/kidsweb/explore/calendar/january/seijinshiki.html