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

Other days

tulip

Tulip Day
cuddle up

Cuddle Up Day
nae nae

Nae Nae Day
ask out your crush

Ask Out Your Crush Day
one

One Day
self care

Self Care Day
gum

Gum Day
lash

Lash Day
bow tie

Bow Tie Day
kale

Kale Day