In this task, you're given an ambiguous question (which can be answered in more than one way). Your task is to write a question that clarifies the given question in such a way that the generated question has one unique answer.

When did the nfl start playing on christmas day?
When did the nfl first start playing on christmas day?

When did the rolling stones play in hyde park?
When did the Rolling Stones play in Hyde Park for free?

When is the fa cup semi final played?

When is the fa cup semi final played in 2017?