Oops, it doesn't look like 'is packed at all times of the day' is a national day..

Other days

martini

Martini Day
stress awareness

Stress Awareness Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
blanket fort

Blanket Fort Day
tell a fairytale

Tell A Fairytale Day
lost sock memorial

Lost Sock Memorial Day
hiv awareness

Hiv Awareness Day
prosecco

Prosecco Day
lumpy rug

Lumpy Rug Day
pumpkin

Pumpkin Day