Question: when did the wave hill walk off occur
[{'answer': 'August 1966', 'provenance': [{'wikipedia_id': '1422478', 'title': 'Wave Hill walk-off', 'start_paragraph_id': 1, 'start_character': 131, 'end_paragraph_id': 1, 'end_character': 142, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1422478', 'title': 'Wave Hill walk-off', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 235, 'bleu_score': 0.646900083368504, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4362787319297696581}, 'section': 'Section::::Abstract.'}]}]