Problem: Given the question: Generate a question that has the following answer: A sock hop for the following movie plot: The movie opens with a young couple, Pat Wheeler (Grady Vaughn) and Liz Humphries (Yolanda Salas), parked in a bleak, rural locale overlooking a ravine. A giant gila monster attacks the car, sending it into the ravine and killing the couple. Later, some friends of the couple decide to assist the local sheriff (Fred Graham) in his search for the missing teens. Chase Winstead (Sullivan), a young mechanic and hot rod racer, locates the crashed car in the ravine and finds evidence of the giant lizard. However, it is only when the hungry reptile attacks a train (a model train set substituted as a low-budget effect) that the authorities realize they are dealing with a (roughly) 70-foot poisonous lizard. By this time, emboldened by its attacks and hungry for prey, the creature attacks the town. It heads for the local dance hall, where the town's teenagers are gathered for a sock hop. However, Chase packs his prized hot rod with nitroglycerin and rigs it to speed straight into the monster, terminating the lizard in a fiery explosion and heroically saving the town.
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The answer is:
Why are the town's teenagers gathered at the local dance hall?

input question: Generate a question that has the following answer: Patience for the following movie plot: Jamaica Inn is the headquarters of a gang of wreckers led by the innkeeper Joss Merlyn (Leslie Banks). The wreckers are responsible for a series of engineered shipwrecks in which they extinguish coastal warning beacons to cause ships to run aground on the rocky Cornish coast. Then they kill the surviving sailors and steal the cargo from the wrecks. Beautiful, young Mary Yellan (Maureen O'Hara) is travelling to Jamaica Inn in a carriage, but the driver is afraid to stop there and drives a long way past the inn in spite of her repeated demands that he stop. Instead, he drops her off near the home of the local squire and justice of the peace, Sir Humphrey Pengallan (Charles Laughton). She meets him and requests the loan of a horse so she can go back to Jamaica Inn. Pengallan warns her not to go there. Nevertheless, Mary says she just came from Ireland, and as the orphaned niece of Joss's wife Patience (Marie Ney), she intends to live at Jamaica Inn. Unable to convince her to stay, Pengallan accompanies Mary to Jamaica Inn. When Joss meets Mary, he tries to kiss her and push himself on her. Patience is distraught to learn her sister, Mary's mother, has died. When Mary tells Joss that Pengallan has accompanied her to Jamaica Inn, Joss goes upstairs and reports to Pengallan. We learn that Pengallan is the secret criminal mastermind behind the wrecking gang, who finds out when well-laden ships are passing near the coast, determines when and where the wrecks are to be done, disposes of the stolen cargo, and uses the booty to support his lavish lifestyle, passing a small fraction of the takings back to Joss and the gang. In another part of the inn, the gang convenes to discuss why they get so little money for their efforts. They suspect Jem Traherne (Robert Newton), a gang member who has been with them for only two months, of embezzling goods. They hang him from one of the rafters of the inn, but Mary cuts the rope afterwards and saves his life. Together, Traherne and Mary flee from the gang. They are almost...???
output answer: Who is distraught to learn her sister, Mary's mother, has died?

Please answer this: Generate a question that has the following answer: Christmas Eve for the following movie plot: On Christmas Eve 1950, Wilfred Butler runs out of his rural house and appears to have been set on fire. He collapses in the snow and is believed to be dead. Twenty years later, lawyer John Carter and his assistant Ingrid arrive in a small Massachusetts town on Christmas Eve. John meets with the town's nobles, Mayor Adams, Tess Howard, Sheriff Bill Mason and Charlie Towman. John is revealed to be the lawyer of Jeffrey Butler, Wilfred's grandson, and is trying to sell the Butler mansion for $50,000 by noon the next day. After a call to his wife, John is revealed to be having an affair with Ingrid. The two stay the night at the Butler mansion, unaware that they are being watched. After dinner, the two go upstairs to a bedroom to have sex. The mysterious person walks in on them and kills them both with a felling axe. The killer calls the police and reveals himself to be "Marianne." After Tess, who is the town's phone operator, intercepts the call, she leaves her assistant in charge and drives out to the Butler mansion. Marianne greets Tess, who is visibly frightened. She is knocked over the head repeatedly with a candle holder. At the same time, Sheriff Mason is heading to the mansion, but stops at the nearby cemetery after seeing a disturbed gravesite from the road. Upon approaching the grave, he discovers it is Wilfred Butler's, and that the grave has been dug up and Butler's body removed. He is struck over the head and killed, and falls into the grave. Mayor Adams receives a strange phone call asking him to go to the Butler mansion; he leaves his adult daughter Diane at home alone. Not long after Adams leaves, a man arrives at the house and says his name is Jeffrey Butler, Wilfred's grandson. Jeffrey says he found the sheriff's car abandoned at the cemetery and "borrowed" it. After a brief conversation, Diane and Jeffrey go up to the cemetery to look for the sheriff. They stumble upon Wilfred's disturbed grave, but find no sight of the sheriff. The two go into town to Towman's to see if they can find out what...
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Answer:
When do John and Ingrid arrive in the town?