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

Other days

boba

Boba Day
pampering

Pampering Day
artists

Artists Day
stud

Stud Day
get funky

Get Funky Day
nae nae

Nae Nae Day
eat what you want

Eat What You Want Day
china

China Day
cat girl

Cat Girl Day
raise awerness of zeus

Raise Awerness Of Zeus Day