The two-night “Star Wars: Galactic Starcruiser” experience, opening Tuesday at Walt Disney World in Orlando, puts guests into a story set on the Halcyon, a sleek space vessel said to be the place where Princess Leia and Han Solo took their honeymoon. Also attending are celebrated former Doctor Who writers Mark Gatiss and Steven Moffat, movie character costumes who are took part in a panel discussion for BBC’s Dracula yesterday.