ROYAL WELCOME: Ralph Lauren will be among the guests at a charity dinner hosted by Prince William, the Duke of Cambridge, at Windsor Castle on May 13. The event is in aid of the Royal Marsden Cancer Charity, of which William is president. According to the prince’s official diary, the dinner will highlight the work of The Royal Marsden, a specialist cancer treatment center in London’s Chelsea. Lauren will attend the dinner during a two-day visit to London, during which he will tour the hospital. Queen Elizabeth is the charity’s patron.