The premiere of Richard Wagner’s romantic opera Tannhäuser will inaugurate the 9th Hoffmann Festival at the Grand Theatre in Poznań. Tannhäuser is another production — following “Undine,” “Aurora,” “The Nutcracker,” and “Coppélia” — linked to the figure of E.T.A. Hoffmann, after whom the Polish-German Opera Festival in Poznań is named. The opera’s plot, for which Wagner wrote the libretto…