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

Other days

eat what you want

Eat What You Want Day
martini

Martini Day
prosecco

Prosecco Day
reading

Reading Day
ride the wind

Ride The Wind Day
pick me

Pick Me Day
law

Law Day
promposal

Promposal Day
bow tie

Bow Tie Day
brow

Brow Day