Saudi King Salman and Crown Prince Mohammed bin Salman attended the ground-breaking ceremony on Saturday of a vast entertainment resort that is at the heart of an ambitious strategy to open the economy and ease social restrictions. Little more than a week after Saudi Arabia opened its first cinema after a nearly four-decade ban, the author of the reforms, Prince Mohammed, and his father attended the lavish launch ceremony, which featured a live orchestra, fireworks and a vocal performance praising both leaders.