I also never miss Spring Into Horror and Frightfall Readathons, hosted by Michelle Miller of Seasons of Reading.
April is Horror!
For me, there will be my icon, H. P. Lovecraft. Likely there will Clark Ashton Smith, Robert E. Howard, Robert W. Campbell; Caitlin R. Kiernan, Ruthann Emrys, Richard Chizmar, Curtis M. Lawson, the DARK SCREAMS series; and many, many others.
Rock on, April, rock on.