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

Other days

believe

Believe Day
cuddle up

Cuddle Up Day
my little pony

My Little Pony Day
ruby

Ruby Day
bow tie

Bow Tie Day
hoodie

Hoodie Day
kiss a ginger

Kiss A Ginger Day
polyamory

Polyamory Day
nail polish

Nail Polish Day
reading

Reading Day