As the Omicron variant looms, Bartlett Sher’s production of Verdi’s classic is set to open on New Year’s Eve.Bartlett Sher must have logged over a mile inside the Metropolitan Opera as a rehearsal for his staging of Verdi’s “Rigoletto” unfolded in fits and starts on a recent morning.Whenever the singers came to a stop, Sher sprinted. Sometimes up stairs near the orchestra pit, with notes for the cast. Sometimes up the aisle of the auditorium to confer with a team working at consoles and laptops. He had a growing list of things to refine: the set’s paint job, the lighting, the layering of a party scene’s crowded action.“I need another month,” he said, pausing to scrutinize the stage.Instead, Sher had about two weeks. His “Rigoletto” opens Dec. 31, part of the Met’s annual New Year’s Eve gala, with Daniele Rustioni conducting and Quinn Kelsey in the title role. This staging, a coproduction with the Berlin State Opera, premiered in Germany in June 2019. But so much has changed in transit that it’s been virtually rebuilt from scratch — down to the wire and under the threat of the Omicron variant.Bartlett Sher, left, rehearsing his staging with Sylvia D’Eramo and Piotr Beczala.Julieta Cervantes for The New York TimesThe new “Rigoletto” by Sher — a busy Tony Award-winning director whose work is currently on Broadway (“To Kill a Mockingbird”) and coming soon to Lincoln Center Theater (“Intimate Apparel”) — is the third to be seen at the Met this century. Piotr Beczala, the tenor starring as the predatory Duke of Mantua, jokingly said in an interview that he is “the Duke on duty here”: In 2006, he made his company debut with the role in Otto Schenk’s 1989 production, then originated it in Michael Mayer’s Rat Pack “Rigoletto” in 2013.That’s a lot of turnover for a house where some stagings linger for decades. Peter Gelb, the Met’s general manager, said that there is no “standardized thinking” behind replacing productions. Two, Franco Zeffirelli’s lavishly traditional takes on “La Bohème” and “Turandot,” are not going anywhere, Gelb said. But he has noticed that audiences tend to lose interest more quickly in modern updates — such as Mayer’s “Rigoletto,” set in 1960s Las Vegas instead of the libretto’s 16th-century Italy.Waning interest wasn’t the only problem with Mayer’s production. Its muddled dramaturgy baffled critics, and it developed a reputation as a neon-lit spectacle of little substance. Reviewing the premiere, Anthony Tommasini of The New York Times wrote that the concept was “hardly audacious” and “not even that original.” When it was notable, it was as a vehicle for guest artists — including the soprano Rosa Feola, who had a sensational Met debut as Rigoletto’s daughter, Gilda, in 2019 and is returning to that role now.The costume designer, Catherine Zuber, left, in a fitting with the soprano Rosa Feola, who sings the innocent Gilda.Like Mayer, Sher transposes the action of the opera, but to Weimar-era Berlin — a “prefascist world,” he said, of unchecked cruelty, crime and extravagance. He avoided setting the work under Nazi rule, instead opting for the 1920s, the same milieu as the popular TV series “Babylon Berlin”: a society on the brink of upheaval. The period tracked with the libretto’s dukes and duchesses while allowing Sher to explore “how a corrupt leadership infects a culture, infects how wealth and privilege dominate and squish people below it.”Sher’s ideas hit a roadblock in Berlin. He had planned for the set to rotate on a turntable, for cinematic transitions and fruitful divisions of public and private spaces. It ended up fixed in place, an Art Deco nightclub with murals adapted from works by George Grosz, who caricatured the era’s corruption and complicity.“It was more static,” Sher recalled, “and harder to release what was in the music.”Reviews from the German press were harsh, and several were dismissive of Sher as an American. I had my own problems with the production, writing in The Times that Sher’s treatment of the Weimar Republic came off as “more of a context than a concept.”In its original Berlin incarnation, seen here, Sher’s production was different, with a static view of the set and murals made from George Grosz paintings.Brinkhoff/MogenburgSher admitted that his Berlin staging had room to grow, particularly in how to communicate the work’s psychological complexity. But he was happy with it.“I felt it was honest, and it was clear,” he said. “A good artist should accept the limitations of each iteration of what they’re doing. And this was like the workshop production to fall in love with the work.”He has now had an opportunity to revise his production the way he might during a musical’s preview performances, a luxury almost never afforded to opera. (An exception, as it happens, is “Intimate Apparel.”) His intentions for the Met revival are largely the same, he said, but it will differ from Berlin in crucial ways.At last, he has his turntable, and thus a much different set; indeed, the first view, during the prelude, is of a grungy brick exterior rather than the explosion of color inside. Gone are the Grosz murals, replaced by searing red marble — a problem with the artist’s estate, Sher said, though the scene-setting curtain, taken from a Grosz painting, remains.Costume designs for Sher’s production, which is set in Berlin on the brink of Nazi rule.The cast only recently began to rehearse with the rotating nightclub onstage. Earlier, they prepared in a basement studio with only suggestions of it — a door frame, a pillar — and Sher blocking their movement as he narrated how the set would turn. A copy of “Le Roi S’Amuse” (“The King Amuses Himself”), the Victor Hugo play that inspired the opera, was on hand for reference. Rustioni was perched on a stool, waving his baton and singing along from memory. (During breaks, he swiveled to the left to study Mozart’s “Le Nozze di Figaro,” which he will lead at the Met beginning Jan. 8.)Beczala, who was days away from opening Massenet’s “Werther” when the Met shut down in March 2020, was back at rehearsals there for the first time since then. And Kelsey, a fixture at the house for over a decade, was bracing for his biggest role yet — “my first proper lead,” he said. Many of the directions Sher gave them during the basement rehearsal were about bringing more transparency to the opera’s complex opening scene.Clarity is a hallmark of Sher’s work, whether the production is “Rigoletto” or “South Pacific.” He said it’s something he strives for “to release the power and truth of the opera, and hopefully add to that some layer of meaning of its resonance today.”After a pause, he added with a laugh, “No big deal.”The conductor Daniele Rustioni led the score from memory in rehearsal, and used breaks to study Mozart’s “Le Nozze di Figaro.”That resonance, Kelsey said, is very much present in the production. “It’s so surprising how that really mirrors a lot of what we’re feeling in our country now, regardless of what side you’re on — just the tension itself,” he added. More complicated are the dynamics at play among the principal characters. Rigoletto believes that the tragic events that lead to the death of his daughter are the result of a dishonored nobleman’s curse. But the opera isn’t so simple.“I like to say that the Duke is polyamorous, but he hasn’t worked out his ethical non-monogamy,” Sher said. “He just goes at everything, then drops it in a second, which is really dangerous. Yet Gilda, this poor innocent girl, is already manipulated by the ridiculously overemphatic love of her father, and she’s in a washing machine between him and the Duke. The big journey for me is to figure out how to give her some agency over these men who are dominating her.”Behind all this is the score, which opens with the theme of the curse and never really emerges from that darkness. “Verdi was so proud of the curse,” Rustioni said. “You see it repeated, the dotted rhythm coming back when Rigoletto sings. It’s like an idée fixe.”Among Rustioni’s restorations to the opera — such as an often-cut cadenza in an Act I duet for Gilda and the Duke — is keeping a line of Rigoletto’s as a string of C notes, rather than ending in a higher E flat, to echo the curse motif.Sher said he was aiming for “a mise-en-scène that ripples through the music and text.”“I think the production is very respectful toward Verdi,” Rustioni said. “Everything is built into the music, and this constantly changing, rotating element helps to carry the mood.”Sher said that the “cinematic movement” of his set was his way of achieving “a mise-en-scène that ripples through the music and text.” Ideally, he added, “with enough time you can really get it right. We’ll see.”One obstacle could get in his way. About 10 days before opening night, the Omicron variant was rapidly spreading throughout New York City. Lines snaked around the blocks of testing sites, and panic fueled a run on at-home testing kits. Broadway shows were in a precarious state of anticipation and sudden cancellations, and the storied “Christmas Spectacular Starring the Radio City Rockettes” prematurely ended its run because of breakthrough infections in its cast.The Met, which hasn’t yet had to cancel a performance, has taken what safety measures it can — a no-exceptions vaccine mandate, with a booster requirement on the way in January, and twice-weekly testing within the company — and Gelb said that until recently he had been “extremely confident.” Now, he feels a kinship with the hapless Rigoletto.“He has his curse which ruins his life,” Gelb said. “We’re all sort of under a larger curse: We have the curse of Omicron.” More