Pictured: Lavina Jadhwani Writers Theatre has announced its 2018/19 six-show season, opening with Qui Nguyen’s “Vietgone,” with original music by Shane Rettig, directed by Lavina Jadhwani. The season will continue with William Shakespeare’s comedy “Twelfth Night” directed by Artistic Director Michael Halberstam and August Wilson’s “Ma Rainey’s Black Bottom,” directed...