Final answer:
In the 'Diary of a Wimpy Kid' series, the main character, Greg Heffley, is a child and does not bring his own child to work. The series commonly features school-aged children getting into comedic mishaps.
Step-by-step explanation:
The event that occurred on "Bring Your Child to Work Day" in the book Diary of a Wimpy Kid is option c: The main character's child causes trouble and disrupts the workplace. In the series, Greg Heffley, who is the main character, often finds himself in humorous and troublesome situations. Although Greg himself is the child in the story, and there is no actual depiction of him bringing a child to work, the theme of the series often involves school-aged children and the amusing mishaps that befall them. Therefore, if this scenario were to happen in the context of the book, it would likely involve Greg or one of his peers causing disruptions on such an occasion, rather than Greg being an adult bringing his own child to work.