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

Other days

donate your hair

Donate Your Hair Day
pick me

Pick Me Day
blanket fort

Blanket Fort Day
slime

Slime Day
nae nae

Nae Nae Day
stud

Stud Day
kale

Kale Day
my little pony

My Little Pony Day
cursing

Cursing Day
gum

Gum Day