Question: when was woodstock festival held in the catskills of new york
[{'answer': 'August 18', 'provenance': [{'wikipedia_id': '33884', 'title': 'Woodstock', 'start_paragraph_id': 93, 'start_character': 55, 'end_paragraph_id': 93, 'end_character': 64, 'bleu_score': 1.0, 'section': 'Section::::Legacy.:Woodstock site today.\n'}]}, {'answer': 'August 15 -- 17 , 1969'}]