ABBA Voyage, ABBA Arena, London BACK in the bad old days of Covid and lockdowns we all became used to entertainment and sporting events taking place without spectators. At the ABBA Arena in Stratford, East London, we have the opposite – a concert with a capacity 3,000-strong crowd of joyous, arm-waving fans where the performers are missing. On stage, in place of Swedish superstars ABBA, are digitally-created three-dimensional figures known as avatars – or rather, ABBAtars.