Oops, it doesn't look like 'hangover gym sign up gym attendance drop off day' is a national day..

Other days

bow tie

Bow Tie Day
brow

Brow Day
hot chocolate

Hot Chocolate Day
lumpy rug

Lumpy Rug Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
pumpkin

Pumpkin Day
self appreciation

Self Appreciation Day
artists

Artists Day
buddy

Buddy Day
special education

Special Education Day