Read: 3 min It’s been the crucible of music icons from ABBA to Celine Dion, a flashy symbol of European integration, the charged focal point for geopolitics and a stage for social change. For seven decades, the Eurovision Song Contest — which gathers performers from across Europe and further afield, selected by each country’s public broadcasting service — has delighted and, at times, baffled spectators. Now the annual competition is gearing up f…