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

Other days

bow tie

Bow Tie Day
kale

Kale Day
frozen yogurt

Frozen Yogurt Day
girl friend

Girl Friend Day
boy friend

Boy Friend Day
my little pony

My Little Pony Day
gum

Gum Day
brow

Brow Day
buddy

Buddy Day
youth

Youth Day