HBO has dated the premieres for several shows: HBO has confirmed that the new seasons of GAME OF THRONES, SILICON VALLEY and VEEP will debut back-to-back on SUNDAY, APRIL 24, starting at 9:00 p.m. (ET/PT). GAME OF THRONES begins its ten-episode sixth season SUNDAY, APRIL 24 (9:00-10:00 p.m.). Based on the popular book series “A