Oops, it doesn't look like 'delco day' is a national day..

Other days

china

China Day
boba

Boba Day
pumpkin

Pumpkin Day
unicorn

Unicorn Day
bounce

Bounce Day
latina equal pay

Latina Equal Pay Day
tell a fairytale

Tell A Fairytale Day
buddy

Buddy Day
bow tie

Bow Tie Day
youth

Youth Day