text: what is japanese's constitution day?   constitution memorial day (japanese: 憲法記念日, kenpō kinen-bi) is a national holiday in japan. it takes place on may 3 in celebration of the promulgation of the 1947 constitution of japan. it is a part of the collection of holidays known as golden week.[1]  a holiday since the current japanese constitution came into effect on may 3, 1947, this is the only day of the year that the national diet building (国会議事堂, kokkai-gijidō) is open to the public.[2] being a day that draws its significance from the japanese constitution, constitution memorial day is often chosen as a day to reflect on the meaning of democracy and japanese government. for instance, in 2003, a number of newspapers featured editorials regarding the constitution's embattled article 9.[3]