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

Other days

reading

Reading Day
self appreciation

Self Appreciation Day
blanket fort

Blanket Fort Day
ormille

Ormille Day
aloxolt

Aloxolt Day
ponytail

Ponytail Day
gum

Gum Day
lisp

Lisp Day
slime

Slime Day
camera

Camera Day