Illustration: Laura Callaghan for New York Magazine When was the moment Ireland became cool? Was it in December 2018, when Derry Girls hit Netflix, introducing a global audience to Northern Ireland’s ’90s pop-culture ephemera? Or was it a few months later, when Sally Rooney ’s Normal People arrived in the U.S., occasioning multiple glowing New York Times reviews and spurring the first wave of trend pieces about “the cult of Sally Rooney”? Either way, by the time The Banshees of Inisherin was