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

Other days

boba

Boba Day
singles

Singles Day
ride the wind

Ride The Wind Day
one

One Day
pumpkin

Pumpkin Day
hannah

Hannah Day
promposal

Promposal Day
eat what you want

Eat What You Want Day
nail polish

Nail Polish Day
youth

Youth Day