Oops, it doesn't look like 'leave ya mans day' is a national day..

Other days

lost sock memorial

Lost Sock Memorial Day
my little pony

My Little Pony Day
one

One Day
camera

Camera Day
gum

Gum Day
bow tie

Bow Tie Day
pick me

Pick Me Day
singles

Singles Day
cuddle up

Cuddle Up Day
self care

Self Care Day