Question: when was the kwanzaa festival created and by who
[{'answer': 'Maulana Karenga', 'provenance': [{'wikipedia_id': '17422', 'title': 'Kwanzaa', 'start_paragraph_id': 1, 'start_character': 356, 'end_paragraph_id': 1, 'end_character': 371, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'first celebrated in 1966 -- 67'}, {'provenance': [{'wikipedia_id': '17422', 'title': 'Kwanzaa', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 399, 'bleu_score': 0.905470351340632, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2789993974331190070}, 'section': 'Section::::Abstract.'}]}]