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

Other days

healing

Healing Day
bow tie

Bow Tie Day
bonang

Bonang Day
slime

Slime Day
pumpkin

Pumpkin Day
latina equal pay

Latina Equal Pay Day
gum

Gum Day
china

China Day
boba

Boba Day
nae nae

Nae Nae Day