Definition: This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.
Input: Many traditional festivals and customs were observed in the old times, which included climbing the City Wall on January 16, bathing in Qing Xi on March 3, hill hiking on September 9 and others (the dates are in Chinese lunar calendar). Almost none of them, however, are still celebrated by modern Nanjingese.
Output:
When was the festival of climbing on the city wall celebrated?