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

Other days

bounce

Bounce Day
slime

Slime Day
tulip

Tulip Day
lumpy rug

Lumpy Rug Day
cursing

Cursing Day
brow

Brow Day
ride the wind

Ride The Wind Day
frozen yogurt

Frozen Yogurt Day
self care

Self Care Day
fiancee

Fiancee Day