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

Other days

ask out your crush

Ask Out Your Crush Day
buddy

Buddy Day
azonto is acceptable

Azonto Is Acceptable Day
unicorn

Unicorn Day
boba

Boba Day
gum

Gum Day
pick me

Pick Me Day
martini

Martini Day
bow tie

Bow Tie Day
law

Law Day