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

Other days

slime

Slime Day
kale

Kale Day
frozen yogurt

Frozen Yogurt Day
brow

Brow Day
bow tie

Bow Tie Day
cuddle up

Cuddle Up Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
first love

First Love Day
self care

Self Care Day
cursing

Cursing Day