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

Other days

ruby

Ruby Day
bow tie

Bow Tie Day
lash

Lash Day
gum

Gum Day
cuddle up

Cuddle Up Day
aloxolt

Aloxolt Day
my little pony

My Little Pony Day
ponytail

Ponytail Day
brow

Brow Day
donate your hair

Donate Your Hair Day