4 April 1964: broadcast of “Assassin at Peking”, seventh episode of the story we now call Marco Polo. The Khan wins the Tardis from the Doctor at backgammon, but releases the Tardis crew and allows Marco Polo to return to Venice when they prevent Tegana’s assassination attempt.
4 April 1970: broadcast of third episode of The Ambassadors of Death. The Doctor and Liz realise that the astronauts are absorbing so much radiation that they must be aliens; but Carrington’s men are in pursuit.
4 April 2008: broadcast of Exit Wounds, last episode of the second season of Torchwoodii) date specified in canon
4 April ?2010: setting of Planet of the Dead (2009).
I disliked THE IRON DRAGON’S DAUGHTER violently. I had big problems with the worldbuilding in THE HUNGER GAMES, but OTOH, I read it and its two sequels in 2 days. 🙂 I loved LOCKE LAMORA. 🙂