You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
In this task, you will be shown an extract from a movie plot. You need to read the extract and create questions that can be answered from the extract. The questions should be well-formed and grammatically correct. The questions should be completely answerable from the given passage and should not require any external knowledge. Subjective questions are not allowed. Create questions that result in factoid answers. A simple rule of thumb to decide whether a question is factoid or not is to see if two different people with average reading/comprehension skills would come up with the same answer after reading the passage.

Twenty-year-old Will Hunting of South Boston is a self-taught, genius-level intellect, though he works as a janitor at the Massachusetts Institute of Technology and spends his free time drinking with his friends, Chuckie (Ben Affleck), Billy (Cole Hauser) and Morgan (Casey Affleck). When Professor Gerald Lambeau (Stellan Skarsgard) posts a difficult mathematics problem as a challenge for his graduate students, Will solves the problem anonymously, stunning both the graduate students and Lambeau himself. As a challenge to the unknown genius, Lambeau posts an even more difficult problem. Lambeau chances upon Will solving the problem but Will flees the scene. That night at a bar, Will meets Skylar (Minnie Driver), a British student about to graduate from Harvard, who plans on attending medical school at Stanford and gives Will her phone number before leaving.
Solution: How old is Will Hunting in the movie ?
Why? This is a good question which has a factoid answer.

New input: Set in 1953, the film explores the budding relationship between Billy Joe McAllister (Benson) and Bobbie Lee Hartley (O'Connor) (who corresponds to the unnamed narrator of the original song), despite resistance from Hartley's family, who contend she is too young to date. One night at a jamboree, McAllister gets drunk and seems nauseated and confused when entering a makeshift whorehouse behind the gathering.It turns out that in his inebriated state, he had sex with another man, later revealed to be his sawmill boss, Dewey Barksdale (James Best). After disappearing for days, he returns to bid an enigmatic goodbye to Bobbie Lee. Overcome with guilt, Billy Joe subsequently kills himself by jumping off the bridge spanning the Tallahatchie River. In the film's final scene, Bobbie Lee meets Dewey on the bridge as she is leaving town, and he guiltily confesses to her that he was the man. She tells Barksdale, who is on his way to her house to confess to her father, that the town already suspects that she is carrying Billy Joe's baby and that it would do no good for Barksdale to confess now. Agreeing with the girl's logic, Barksdale offers Bobbie Lee a ride to the bus station, which she courteously accepts.
Solution:
At what event does Mccallister get drunk?