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

Other days

ormille

Ormille Day
artists

Artists Day
pumpkin

Pumpkin Day
hoodie

Hoodie Day
pick me

Pick Me Day
gum

Gum Day
blanket fort

Blanket Fort Day
coffee

Coffee Day
my little pony

My Little Pony Day
tulip

Tulip Day