Question: when do the twin tower lights come on
[{'answer': 'every year on September 11', 'provenance': [{'wikipedia_id': '44103', 'title': 'Tribute in Light', 'start_paragraph_id': 6, 'start_character': 209, 'end_paragraph_id': 6, 'end_character': 235, 'bleu_score': 1.0, 'section': 'Section::::Background.\n'}]}, {'provenance': [{'wikipedia_id': '44103', 'title': 'Tribute in Light', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 326, 'bleu_score': 0.950395837060061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3607902680772069778}, 'section': 'Section::::Background.\n'}]}]