It’s an October weekend in Denver. Unseasonably mild, given the time of year. On the second-floor open-air patio of an upscale food hall, a gentle breeze rustles the pages of a half dozen open yearbooks. Minh Nguyen, a Plano optometrist and Pokémon Go enthusiast, and his fiancée, Megan, have arranged the books across a long table overlooking the Mile High City. Now it’s just a matter of time. As Minh scans the lunch rush crowd, one face catches his eye.