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

Other days

slime

Slime Day
coffee

Coffee Day
self care

Self Care Day
youth

Youth Day
china

China Day
hoodie

Hoodie Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
offer

Offer Day
gum

Gum Day
blanket fort

Blanket Fort Day