Instructions: Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.
Input: Context : The Duchess of Richmond's ball was held in Brussels on 15 June 1815, the night before the Battle of Quatre Bras, by Charlotte, Duchess of Richmond.
Answer : 15 June 1815
Output:
The point in time of Duchess of Richmond's ball was when?