Task: Question Generation
Input (English): Context : The 1958 Syerston Avro Vulcan crash was a military aviation accident that occurred in England on 20 September 1958 during an air show at RAF Syerston, Nottinghamshire when a prototype Avro Vulcan bomber crashed. 
Answer : 20 September 1958
Output (English): The date of 1958 Syerston Avro Vulcan crash was what?