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

Other days

kale

Kale Day
martini

Martini Day
pick me

Pick Me Day
bow tie

Bow Tie Day
carpenters

Carpenters Day
camera

Camera Day
blanket fort

Blanket Fort Day
prosecco

Prosecco Day
chocolate milkshake

Chocolate Milkshake Day
artists

Artists Day