Oops, it doesn't look like 'flags to hoist on independence day' is a national day..

Other days

coffee

Coffee Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
boba

Boba Day
hannah

Hannah Day
embarrass your best friend

Embarrass Your Best Friend Day
ask out your crush

Ask Out Your Crush Day
prosecco

Prosecco Day
me

Me Day
prescription drug take back

Prescription Drug Take Back Day
lisp

Lisp Day