Oops, it doesn't look like 'banana benana day' is a national day..

Other days

hoodie

Hoodie Day
kiss a brunette

Kiss A Brunette Day
carpenters

Carpenters Day
gallery

Gallery Day
stud

Stud Day
boy friend

Boy Friend Day
one

One Day
cat girl

Cat Girl Day
my little pony

My Little Pony Day
youth

Youth Day