The Rugby Football Union ( RFU ) has set out new plans to bring more concerts to Twickenham ’s Allianz Stadium as it seeks to redevelop the home of English rugby. A stadium revamp believed to cost in excess £600m is looming for the union, with an expansion of non-rugby event days at the southwest London ground seen as critical to ensuring the necessary redevelopment can go ahead. About 85 per cent of the RFU’s revenues come from Allianz Stadium, with a large proportion from major men’s matchdays. Under the terms of its agreement with Richmond Borough Council, English rugby’s governing body is only permitted to hold three non-sporting event days per year, with none held consecutively and capacity capped at 55,000. Under new plans submitted to Richmond Borough Council, the RFU hopes to introduce a phase and staggered increase in the number of events at the ground to 15 per year – still far fewer than are permitted annually at fellow London venues Wembley Stadium (54) and the Tottenham Hotspur Stadium (30).…