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

Other days

girl friend

Girl Friend Day
promposal

Promposal Day
fiancee

Fiancee Day
boba

Boba Day
buddy

Buddy Day
bow tie

Bow Tie Day
latina equal pay

Latina Equal Pay Day
pick me

Pick Me Day
mean girls

Mean Girls Day
kiss a ginger

Kiss A Ginger Day