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

Other days

slime

Slime Day
boy friend

Boy Friend Day
tulip

Tulip Day
my little pony

My Little Pony Day
bow tie

Bow Tie Day
ormille

Ormille Day
one

One Day
stud

Stud Day
polyamory

Polyamory Day
ponytail

Ponytail Day