He rested his elbows on the table, plopped his chin in his hands, and said with a mischievous grin, “Tell me everything.” My wife and I were visiting London to see the Harry Potter and the Cursed Child play when it debuted. It’s a 2-show series, usually playing back-to-back nights, but we chose the option for a morning and afternoon show with a several hour mid-day intermission so we could see it all in one day. After a little Yelp browsing and Google searching, we resorted to walking a...