Welcome to the weekend edition of What’s On. Here are the big things happening on TV from Friday, April 19 to Sunday, April 21. All times are Eastern. [Note: The weekly edition of What’s On publishes on Sundays.] 1. David Dastmalchian prepares for a Late Night With The Devil Shudder, Friday, 3:01 a.m.: Late Night With The Devil dares to ask: What would happen if a talk show host got tangled up with the occult on live TV? The answer, obviously, is nothing good. Jack Delroy (David Dastmalchian)... Read this story at The A.V. Club , The A.V. Club