Oops, it doesn't look like 'blue print day' is a national day..

Other days

first love

First Love Day
my little pony

My Little Pony Day
aloxolt

Aloxolt Day
stud

Stud Day
ruby

Ruby Day
nae nae

Nae Nae Day
youth

Youth Day
girl friend

Girl Friend Day
gallery

Gallery Day
kiss a brunette

Kiss A Brunette Day