How the Olympics designed its two-city opening ceremony

For totally logical reasons, this year’s Winter Olympics in Italy is bucking the trend of a single host city and splitting its sporting events between two main locations, Milan and Cortina. Milan, the second most populous city in Italy, is the urban setting for indoor events like ice hockey and ice skating. Cortina, a ski resort town 250 miles away, provides most of the snow—and hill-based venues for quintessential Winter Olympic sports like alpine skiing and the bobsled.

But the two...