Two of the city’s biggest outdoor music festivals are taking place this weekend: Afropunk in Fort Greene, Brooklyn, and the Charlie Parker Jazz Festival, which kicked off Wednesday, at various locations in Manhattan. These annual music events may signal that the end of summer is near, but, as Giovanni Russonello writes, the outdoor music season is about to “enter its most enchanted hour.” He offers a guide to some of the outdoor concerts worth your time, including Electric Zoo, Janelle Monáe, Willie Nelson and Mitski. More details on this weekend’s concerts: afropunk.com; cityparksfoundation.org/charlieparker.