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

Other days

gum

Gum Day
kiss a ginger

Kiss A Ginger Day
bow tie

Bow Tie Day
tulip

Tulip Day
buddy

Buddy Day
martini

Martini Day
slime

Slime Day
believe

Believe Day
self care

Self Care Day
boyfriend

Boyfriend Day