Oops, it doesn't look like 'flag week and flag day' is a national day..

Other days

cat girl

Cat Girl Day
boba

Boba Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
prescription drug take back

Prescription Drug Take Back Day
eat what you want

Eat What You Want Day
stress awareness

Stress Awareness Day
bow tie

Bow Tie Day
blanket fort

Blanket Fort Day
emoji

Emoji Day
nae nae

Nae Nae Day