Question: when does the nba 2018 summer league start
[{'answer': 'July 2', 'provenance': [{'wikipedia_id': '57349849', 'title': '2018 NBA Summer League', 'start_paragraph_id': 2, 'start_character': 460, 'end_paragraph_id': 2, 'end_character': 466, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]