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

Other days

carpenters

Carpenters Day
slime

Slime Day
comfy

Comfy Day
get funky

Get Funky Day
bubble bath

Bubble Bath Day
tulip

Tulip Day
hot chocolate

Hot Chocolate Day
nail polish

Nail Polish Day
gum

Gum Day
youth

Youth Day