It’s late on a Sunday afternoon and I’m backing a rental car full of teenagers into a tight space in the sprawling parking lot of MetLife Stadium in New Jersey. A guy wearing a Rolling Stones baseball cap and talking on a cell phone is using his free hand to motion me back, back, back, stop! The moment I step out of the car it’s as if I’m surrounded by friends. I’m greeted by tailgaters in shorts and tank tops who are barbecuing Italian sausage while tossing Frisbees and footballs. It’s 90 degrees and sunny on the acres of blacktop surrounding America’s largest pro football stadium, but everyone is friendly. We share something in common – we have come to see Coldplay kick off its North American tour.