This afternoon at 1:30 EDT, a live performance of Un ballo in maschera on BBC radio from the Royal Opera House, Covent Garden, featuring Karita Mattila in her first production as Amelia, with Marcelo Alvarez, Thomas Hampson, Elisabetta Fiorillo and Camilla Tilling under the baton of Antonio Pappano. (This information comes from the superb resource Operacast.)