The Boston Lyric Opera is set to present “Blythely Ever After.” The concert, which showcases mezzo-soprano Stephanie Blythe as her tenor alter ego Blythely Oratonio, will be performed on May 6 at Royale Nightclub with Philadelphia-based drag artist Sapphira Cristál opening. Blythe will don a beard and rock Wagnerian glam and will perform opera, pop and rock ‘n’ roll to {…}