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

Other days

boy friend

Boy Friend Day
promposal

Promposal Day
ruby

Ruby Day
kiss a ginger

Kiss A Ginger Day
ride the wind

Ride The Wind Day
pampering

Pampering Day
youth

Youth Day
slime

Slime Day
bounce

Bounce Day
china

China Day