What does April have in store for you in science fiction and fantasy? A new Dark Tower novel by Stephen King! Christopher Moore on book tour! Joss Whedon's long-awaited Cabin in the Woods! Nazis at the Center of the Earth! And much, much more.

Here's our complete guide to April's science fiction and fantasy.

Top image: Wind Through the Keyhole by Stephen King.

As always, you can download the io9 calendar as a printable PDF here. And if you have any cool events for May's calendar, drop us a line at calendar@io9.com.

Amazing design and layout by Stephanie Fox, and research/reporting by Gordon Jackson.