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

Other days

hannah

Hannah Day
gum

Gum Day
hiv awareness

Hiv Awareness Day
slime

Slime Day
ormille

Ormille Day
boy friend

Boy Friend Day
nae nae

Nae Nae Day
one

One Day
frozen yogurt

Frozen Yogurt Day
ask out your crush

Ask Out Your Crush Day