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

Other days

boba

Boba Day
ormille

Ormille Day
ruby

Ruby Day
bow tie

Bow Tie Day
gum

Gum Day
tell a fairytale

Tell A Fairytale Day
bubble bath

Bubble Bath Day
carpenters

Carpenters Day
slime

Slime Day
comfy

Comfy Day