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

Other days

gum

Gum Day
eat what you want

Eat What You Want Day
one

One Day
comfy

Comfy Day
pumpkin

Pumpkin Day
boyfriend

Boyfriend Day
tulip

Tulip Day
self appreciation

Self Appreciation Day
bounce

Bounce Day
artists

Artists Day