Question: when does the elf on a shelf appear
[{'answer': 'Thanksgiving', 'provenance': [{'wikipedia_id': '29828921', 'title': 'The Elf on the Shelf', 'start_paragraph_id': 1, 'start_character': 332, 'end_paragraph_id': 1, 'end_character': 344, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '29828921', 'title': 'The Elf on the Shelf', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 584, 'bleu_score': 0.8236852750989211, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7301703488961890505}, 'section': 'Section::::Abstract.'}]}]