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

Other days

aloxolt

Aloxolt Day
cursing

Cursing Day
gum

Gum Day
ask out your crush

Ask Out Your Crush Day
blanket fort

Blanket Fort Day
boy friend

Boy Friend Day
one

One Day
ponytail

Ponytail Day
self care

Self Care Day
first love

First Love Day