Oops, it doesn't look like 'Championship Game Bruins Win And Celtics Win Awesome Sports day' is a national day..

Other days

Fiancee Day

Azonto Is Acceptable Day

Tell Ur Crush You Like Them Day

Cuddle Up Day

Boy Friend Day

Brow Day

Prescription Drug Take Back Day

Martini Day

Prosecco Day

Kiss A Brunette Day