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

Other days

gum

Gum Day
bow tie

Bow Tie Day
china

China Day
nail polish

Nail Polish Day
lost sock memorial

Lost Sock Memorial Day
ormille

Ormille Day
blanket fort

Blanket Fort Day
slime

Slime Day
self care

Self Care Day
book

Book Day