Question: When was the swimming events at the 2014 South American Games held in Estadio Nacional Julio Martínez Prádanos?
Sentence (from "Estadio Nacional Julio Martínez Prádanos"): Estadio Nacional Julio Martínez Prádanos (originally known as Estadio Nacional) is the national stadium of Chile, and is located in the Ñuñoa district of Santiago.
Relevant evidence: Yes