Question: when was night on bald mountain first performed
[{'answer': '23 June 1867', 'provenance': [{'wikipedia_id': '502900', 'title': 'Night on Bald Mountain', 'start_paragraph_id': 1, 'start_character': 359, 'end_paragraph_id': 1, 'end_character': 371, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '502900', 'title': 'Night on Bald Mountain', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 484, 'bleu_score': 0.7260526612664301, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1633245487141621708}, 'section': 'Section::::Abstract.'}]}]