Met Opera highlights ‘Epic Rivalries’ with concerts

“Epic Rivalries” is the the Metropolitan Opera Theatre’s theme of the week, as the company presents: a 2015 pairing of Mascagni’s “Cavalleria Rusticana” and Leoncavallo’s “Pagliacci” on Friday, Jan. 8; Donizetti’s “Maria Stuarda” from 2013 on Saturday, Jan. 9; and Verdi’s “Il Trovatore” from 2011 on Sunday, Jan. 10. All free at 7:30 p.m. via metopera.org.