I've had Wembley up on G Maps. Apparently it's Wembley Park that will be closed. But there is also a Wembley Stadium Station. Wembley Central is on the main street and quit a way from the ground. Last summer I went to see Springsteen at Wembley the attendance was around 90k. Taylor Swift did about 8 nights there, they managed that well enough. No issues with all the stations open. Yet one is closed, and the attendance is reduced by around two thirds.