Question: where are bgt semi finals held this year
[{'answer': 'Hammersmith Apollo', 'provenance': [{'wikipedia_id': '8517686', 'title': "Britain's Got Talent", 'start_paragraph_id': 20, 'start_character': 536, 'end_paragraph_id': 20, 'end_character': 554, 'bleu_score': 1.0, 'section': 'Section::::Format.:Semi-finals and Final.\n'}]}, {'provenance': [{'wikipedia_id': '8517686', 'title': "Britain's Got Talent", 'start_paragraph_id': 63, 'start_character': 0, 'end_paragraph_id': 63, 'end_character': 872, 'bleu_score': 0.9854535765681661, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 106615594320771495}, 'section': 'Section::::Series overview.:Series 12 (2018).\n'}]}]