Oops, it doesn't look like 'flags to attract customers to mark the independent day' is a national day..

Other days

hoodie

Hoodie Day
special education

Special Education Day
singles

Singles 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
gum

Gum Day
promposal

Promposal Day
tell a fairytale

Tell A Fairytale Day
stress awareness

Stress Awareness Day
embarrass your best friend

Embarrass Your Best Friend Day