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

Other days

one

One Day
stress awareness

Stress Awareness Day
ponytail

Ponytail Day
carpenters

Carpenters Day
prescription drug take back

Prescription Drug Take Back Day
self appreciation

Self Appreciation Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
pick me

Pick Me Day
frozen yogurt

Frozen Yogurt Day
donate your hair

Donate Your Hair Day