Final answer:
The question does not provide enough information to accurately tell how children earned money during Bulls or Blackhawks games, but working-class urban dwellers historically found attending football games to be a popular pastime.
Step-by-step explanation:
The question regarding how children earned money during Bulls or Blackhawks games does not provide sufficient context or historical reference to determine a specific, accurate answer. However, in a historical context, working-class children might have engaged in a variety of activities to earn money, including but not limited to concession stand work or street performances depending on the time and social norms.
In regards to the popular pastime for working-class urban dwellers, it is historically known that attending football games was a common leisure activity. People from the working class would often look for inexpensive ways to enjoy their free time, and sports events provided an accessible form of entertainment.