Question: when did the mass shooting in las vegas occur
[{'answer': 'October 1 , 2017', 'provenance': [{'wikipedia_id': '55414735', 'title': '2017 Las Vegas shooting', 'start_paragraph_id': 16, 'start_character': 63, 'end_paragraph_id': 16, 'end_character': 79, 'bleu_score': 1.0, 'section': 'Section::::Shooting.:Attack.\n'}]}, {'provenance': [{'wikipedia_id': '55414735', 'title': '2017 Las Vegas shooting', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 558, 'bleu_score': 0.514596706989048, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15644935688567739236}, 'section': 'Section::::Abstract.'}]}]