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

Other days

kale

Kale Day
boy friend

Boy Friend Day
artists

Artists Day
one

One Day
nae nae

Nae Nae Day
aloxolt

Aloxolt Day
bubble bath

Bubble Bath Day
ormille

Ormille Day
gum

Gum Day
polyamory

Polyamory Day