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

Other days

gum

Gum Day
artists

Artists Day
bounce

Bounce Day
hot chocolate

Hot Chocolate Day
azonto is acceptable

Azonto Is Acceptable Day
pick me

Pick Me Day
ruby

Ruby Day
kiss a brunette

Kiss A Brunette Day
tulip

Tulip Day
comfy

Comfy Day