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

Other days

law

Law Day
bow tie

Bow Tie Day
nae nae

Nae Nae Day
lisp

Lisp Day
azonto is acceptable

Azonto Is Acceptable Day
youth

Youth Day
kale

Kale Day
prosecco

Prosecco Day
offer

Offer Day
blanket fort

Blanket Fort Day