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

Other days

kale

Kale Day
stud

Stud Day
one

One Day
self care

Self Care Day
hannah

Hannah Day
gum

Gum Day
chocolate milkshake

Chocolate Milkshake Day
lash

Lash Day
ruby

Ruby Day
latina equal pay

Latina Equal Pay Day