“‘THE CROWD THOUGHT THE SHOW WAS OVER… THEN EVERY HEAD IN THE ROOM SNAPPED AROUND AT ONCE.’” Then, out of nowhere, Ed Sheeran appeared on a tiny Sydney stage and turned an ordinary night into the kind of story people spend years retelling.

Ed Sheeran wowed fans with an unannounced performance in Sydney on Thursday ahead of his shows this weekend at Accor Stadium. The 35-year-old hitmaker took the stage alongside Irish group…