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

Other days

camera

Camera Day
latina equal pay

Latina Equal Pay Day
ormille

Ormille Day
blanket fort

Blanket Fort Day
youth

Youth Day
mean girls

Mean Girls Day
ponytail

Ponytail Day
aloxolt

Aloxolt Day
cuddle up

Cuddle Up Day
singles

Singles Day