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

Other days

bounce

Bounce Day
one

One Day
reading

Reading Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
hiv awareness

Hiv Awareness Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
gum

Gum Day
camera

Camera Day
my little pony

My Little Pony Day
self appreciation

Self Appreciation Day