Question: who's opening for the weekend in vancouver
[{'answer': 'Tove Lo', 'provenance': [{'wikipedia_id': '48456855', 'title': 'A Head Full of Dreams Tour', 'start_paragraph_id': 12, 'start_character': 164, 'end_paragraph_id': 12, 'end_character': 171, 'bleu_score': 1.0, 'section': 'Section::::Opening acts.\n'}]}]