Final answer:
The Giver is called upon by the Committee of Elders for his wisdom in complex situations requiring guidance and understanding of deep moral questions and societal laws.
Step-by-step explanation:
The Committee of Elders might call upon the Giver for his wisdom in critical situations that require deep understanding and guidance, often when faced with unprecedented challenges or moral dilemmas. The Giver, holding the collective memory and experience of the community, is uniquely positioned to advise the Committee of Elders on complex issues that go beyond the black-and-white rules governing their society. This could include interpreting the unjust laws of men or helping to promote the development of the community, as mentioned in the provided references.