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

Other days

singles

Singles Day
hoodie

Hoodie Day
nae nae

Nae Nae Day
slime

Slime Day
ruby

Ruby Day
donate your hair

Donate Your Hair Day
ask out your crush

Ask Out Your Crush Day
gum

Gum Day
healing

Healing Day
kiss a ginger

Kiss A Ginger Day