In 1919, the OpÃ©ra Populaire holds a public auction to clear the theatre's vaults. The Vicomte de Chagny purchases a papier-mÃ¢chÃ© music box in the shape of a monkey and eyes it sadly as Madame Giry, an aged woman dressed in black, watches him. The auctioneer then presents a shattered chandelier as the next item up for bid, explaining that it once played a key role in "the strange affair of the Phantom of the OpÃ©ra." As it flickers to life and slowly ascends to its original place in the rafters, the audience is transported back in time to the year 1870.Back to this time, while the company rehearses for a performance of the grand opera Hannibal, manager Monsieur LefÃ¨vre announces that he has decided to retire and that the OpÃ©ra has been purchased by Richard Firmin and Gilles AndrÃ©, two men who have no experience with the arts whatsoever. When resident soprano Carlotta Giudicelli begins to sing for the managers, a backdrop collapses and causes everyone to blame the "OpÃ©ra Ghost", a mysterious figure who is rumored to live in the catacombs beneath the theater. Carlotta refuses to sing and storms offstage, leaving Firmin and AndrÃ© no choice but to cancel the performance. At the last minute, ballet mistress Madame Giry suggests that dancer Christine DaaÃ© take Carlotta's place as she has been "well taught." The managers reluctantly agree and, to their surprise, Christine wins them over.Later that night, after Christine's triumphant stage debut, she explains to Madame Giry's daughter Meg that she is being coached by a mysterious tutor who she refers to as the "Angel of Music"; a tutor who her late father said would teach her to sing. Christine returns to her dressing room to find Raoul, the OpÃ©ra's new patron and her former childhood sweetheart, waiting for her. The two reminisce about their youth as Christine tells Raoul her secret, only for him to laugh at her "fantasy" and invite her to dinner despite her protests. Unbeknownst to everyone, except Madame Giry, the Phantom of the OpÃ©ra locks Christine in her dressing room and reveals himself to her before hypnotizing her and taking her to his subterranean lair.The Phantom reveals to her that he loves her and wants her to love him back. He shows Christine a bust of herself, wearing a wedding dress and veil, causing her to faint, and the Phantom places her in a bed. The next morning she awakes to find the Phantom writing music. She approaches him and removes his mask out of curiosity. He bursts into a fit of rage, covering his face with his hand. He at first says she must stay forever because she saw his deformities, revealing that he "dreams of beauty". Pitying him Christine hands him back his mask and the two have a moment of understanding. He then decides to return her to the opera house.That morning, the two managers lament Christine's disappearance, as well as series of notes they received from the Opera Ghost trying to blackmail them for his payment and ordering them on how to run the opera house. When Carlotta returns, she is furious to find a note sent to her saying if she sang as the countess in Il Muto that night instead of Christine, then disaster "beyond [their] imagination" would occur. Firmin and AndrÃ© ignore the ghost's warnings and give Carlotta the lead role. That night, the Phantom interrupts the performance and criticizes their failure to follow his orders.Carlotta continues to sing, but her voice croaks and the lead role is given to Christine. While the ballet is being performed, the Phantom encounters the chief stagehand Joseph Buquet and strangles him before hanging him from above, creating chaos. Christine flees to the roof with Raoul. She reveals to him that she has seen the Phantom's face and fears him, but also pities him because of his sadness. Raoul tells Christine he loves her and will protect her forevermore. Christine returns his love, kissing him passionately and they both leave the roof. The Phantom, who witnessed the scene, becomes heartbroken. He then hears them both singing together. Growing furious at Raoul, he vows revenge on them both.Three months later, a masquerade party ensues in the opera house. At the party, Christine wears her new engagement ring from Raoul. The event is interrupted once again by the Phantom, who is dressed as Red Death. The Phantom brings his own composition, Don Juan Triumphant, and orders the managers to stage the opera. Raoul exits the room and Christine approaches the Phantom. At the sight of the engagement ring, the Phantom rips it from Christine and disappears into a trap on the floor. Raoul tries to follow him but is stopped by Madame Giry, who privately tells him the story of the Phantom's past. When she was a little girl, she went to a freak circus where they featured a deformed child in a cage. The child was beaten while everyone watched and laughed. The ringmaster then removed a burlap sack covering the child's face, revealing his deformity. Only the young Madame Giry pitied him. She was the last to leave and saw the child strangle the ringmaster with a rope. Chased by the police, Madame Giry helped him escape and found shelter for him beneath the opera house, where she has hidden him from the world ever since.Christine takes a carriage to visit her father's grave, but the Phantom secretly takes over the reins. Raoul follows when he realizes she's gone. Christine arrives and laments over her father's death. The Phantom tries to win her back by pretending to be her father's angel, but Raoul arrives and stops him. A sword fight ensues in the cemetery, where Raoul eventually disarms the Phantom and is about to kill him, but Christine pleads for him not to. His rage seemingly augmented, the Phantom watches angrily as Christine and Raoul ride away.Christine admits she is afraid of the Phantom and tells Raoul he will never stop trying to recapture her. Raoul realizes that they can use the Phantom's opera to capture him, as he will surely attend. Don Juan Triumphant is performed, and the Phantom makes his entrance (having secretly replaced the lead) with Christine. Raoul can do nothing but watch from his box as Christine falls for the Phantom yet again. However, she once again removes his mask, revealing his deformities to the entire audience, who scream in fear. He escapes with her by dropping the chandelier and setting the opera house on fire.The Phantom brings Christine back down to his lair. Madame Giry shows Raoul where the Phantom lives, and he goes to rescue Christine. The Phantom forces Christine to don the wedding dress and once again professes his love, and orders Christine to marry him. Christine tries to convince the Phantom that she does not fear his ugliness, but rather his anger and willingness to kill to get what he wants. Just then, Raoul enters the lair, and the Phantom ties him to a gate and threatens to kill him if Christine refuses to marry him. Christine reflects over the impossible choice before passionately kissing the Phantom to show him he is not alone in the world. The Phantom is shocked from experiencing real human love for the first time in his life. Ashamed of his murderous actions, he allows Christine and Raoul to leave and orders them to never return. He finds comfort in a little monkey music box. Christine approaches the Phantom, who tells her that he loves her, and she silently gives him the diamond ring from her finger to remember her by. After Christine and Raoul leave, the Phantom smashes every mirror in his underground lair and disappears through a secret passage behind a velvet curtain just before the police arrive. Upon entering, Meg finds only the Phantom's white mask.Moving back to 1919, the elderly Raoul visits Christine's gravesite and places the music box near her tombstone. He stands in silence for a moment and then turns to leave, but stops upon noticing a red rose with a black ribbon tied around the stem lying on the ground with Christine's engagement ring attached to it; implying that the Phantom still lives and still loves Christine.
Output: Question: What is Opera house holding to celebrate?, Answer: The yearly masked ball