Question: On what occasions do people need to be quiet?
Analysis

This issue discusses in what situations people need to keep quiet. When answering, consider various public and private situations where quietness is required out of respect, safety, or legal obligations. This can include educational settings, religious places, healthcare institutions, libraries, courts, etc.

Synonyms
Try these synonyms instead of repeating the question:
  1. need to→are required to
  2. be quiet →maintain silence
  3. occasions→situations or settings