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

Other days

boba

Boba Day
bonang

Bonang Day
bounce

Bounce Day
pumpkin

Pumpkin Day
comfy

Comfy Day
singles

Singles Day
bow tie

Bow Tie Day
ride the wind

Ride The Wind Day
my little pony

My Little Pony Day
healing

Healing Day