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

Other days

donate your hair

Donate Your Hair Day
youth

Youth Day
kale

Kale Day
comfy

Comfy Day
nae nae

Nae Nae Day
artists

Artists Day
brow

Brow Day
get funky

Get Funky Day
bounce

Bounce Day
ask out your crush

Ask Out Your Crush Day