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

Other days

kiss a ginger

Kiss A Ginger Day
boyfriend

Boyfriend Day
unicorn

Unicorn Day
bow tie

Bow Tie Day
law

Law Day
boba

Boba Day
believe

Believe Day
first love

First Love Day
ask out your crush

Ask Out Your Crush Day
lisp

Lisp Day