The Coming of Age Day
Today January 11 is the Coming of Age Day which celebrate the people who becomes 20 years old this year.
It is called Seijin-No-Hi [成人の日], when we translate the word directly it is "Adult's Day". But dictionaly says "Adult's Day" is wrong translation since it has another meaning. :-p
The attached image is taken from Today's Google Japan.
Many girls who become 20 years old this year dress Japanese Kimono today. In case of boys, it's rare to dress Japanese men's Kimono now a days.