Oops, it doesn't look like 'service up the arse all day' is a national day..

Other days

nae nae

Nae Nae Day
youth

Youth Day
law

Law Day
boba

Boba Day
lumpy rug

Lumpy Rug Day
my little pony

My Little Pony Day
slime

Slime Day
girl friend

Girl Friend Day
hannah

Hannah Day
stud

Stud Day