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

Other days

prosecco

Prosecco Day
bubble bath

Bubble Bath Day
me

Me Day
girl friend

Girl Friend Day
lumpy rug

Lumpy Rug Day
buddy

Buddy Day
nae nae

Nae Nae Day
boy friend

Boy Friend Day
one

One Day
coffee

Coffee Day