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

Other days

my little pony

My Little Pony Day
cuddle up

Cuddle Up Day
slime

Slime Day
bounce

Bounce Day
girl friend

Girl Friend Day
brow

Brow Day
comfy

Comfy Day
first love

First Love Day
china

China Day
blanket fort

Blanket Fort Day