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

Other days

polyamory

Polyamory Day
ask out your crush

Ask Out Your Crush Day
reading

Reading Day
get funky

Get Funky Day
fiancee

Fiancee Day
bow tie

Bow Tie Day
hiv awareness

Hiv Awareness Day
hannah

Hannah Day
buddy

Buddy Day
bounce

Bounce Day