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

Other days

youth

Youth Day
eat what you want

Eat What You Want Day
pick me

Pick Me Day
unicorn

Unicorn Day
stud

Stud Day
fiancee

Fiancee Day
girl friend

Girl Friend Day
frozen yogurt

Frozen Yogurt Day
coffee

Coffee Day
artists

Artists Day