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

Other days

fiancee

Fiancee Day
brow

Brow Day
nail polish

Nail Polish Day
latina equal pay

Latina Equal Pay Day
gum

Gum Day
cat girl

Cat Girl Day
lash

Lash Day
bow tie

Bow Tie Day
believe

Believe Day
boy friend

Boy Friend Day