Question: when do the live shows start for agt
[{'answer': 'quarterfinals', 'provenance': [{'wikipedia_id': '57001539', 'title': "America's Got Talent (season 13)", 'start_paragraph_id': 31, 'start_character': 4, 'end_paragraph_id': 31, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Quarterfinals.\n'}]}, {'provenance': [{'wikipedia_id': '57001539', 'title': "America's Got Talent (season 13)", 'start_paragraph_id': 31, 'start_character': 0, 'end_paragraph_id': 31, 'end_character': 756, 'bleu_score': 0.9845548242372031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10718290541814438056}, 'section': 'Section::::Quarterfinals.\n'}]}]