Question: when did the who play at the pontiac silverdome
[{'answer': 'December 6 , 1975', 'provenance': [{'wikipedia_id': '754366', 'title': 'Pontiac Silverdome', 'start_paragraph_id': 23, 'start_character': 555, 'end_paragraph_id': 23, 'end_character': 572, 'bleu_score': 1.0, 'section': 'Section::::History.:Notable audience attendance numbers.\n'}]}, {'provenance': [{'wikipedia_id': '754366', 'title': 'Pontiac Silverdome', 'start_paragraph_id': 23, 'start_character': 0, 'end_paragraph_id': 23, 'end_character': 772, 'bleu_score': 0.984789766484456, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14557311884378802663}, 'section': 'Section::::History.:Notable audience attendance numbers.\n'}]}]