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

Other days

eat what you want

Eat What You Want Day
reading

Reading Day
coffee

Coffee Day
tell a fairytale

Tell A Fairytale Day
gum

Gum Day
cursing

Cursing Day
nae nae

Nae Nae Day
slime

Slime Day
nail polish

Nail Polish Day
stud

Stud Day