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

Other days

boy friend

Boy Friend Day
camera

Camera Day
nail polish

Nail Polish Day
nae nae

Nae Nae Day
mean girls

Mean Girls Day
gum

Gum Day
girl friend

Girl Friend Day
stress awareness

Stress Awareness Day
boba

Boba Day
ponytail

Ponytail Day