Think back to a time before Kim Kardashian and Snapchatgate, when the biggest Taylor Swift surprises of the year were, one, dumping Calvin Harris for Tom Hiddleston, and, two, secretly ghostwriting “This Is What You Came For,” Harris’s big summertime hit with Rihanna. How innocent we were.
Saturday night, Swift gave her first concert of 2016, a one-off show at the Formula 1…
