Final answer:
The provided excerpts do not contain information about Roland or Moira or an event related to the Diamond club, so an accurate answer cannot be given.
Step-by-step explanation:
The text provided does not mention a character named Roland or any interaction involving convincing someone named Moira to go to the Diamond club. Consequently, it's not possible to definitively answer the original question based on the excerpts given. Further context from the literary work, including the identity of Roland, Moira, and the significance of the Diamond club would be necessary to accurately respond to the student's question.