Oops, it doesn't look like 'go retweet your old pictures day' is a national day..

Other days

Kiss A Brunette Day

Aloxolt Day

Appreciate Yaself A Lil Extra Day

Tulip Day

Embarrass Your Best Friend Day

Unicorn Day

Lost Sock Memorial Day

Hiv Awareness Day

Tell Ur Crush You Like Them Day

Bounce Day