The 1957 1000 km Buenos Aires took place on 20 January, on the Circuito de la Costanera Norte, for this event, was moved from its previous venue, the Autódromo Municipal-Avenida Paz, a 45,000 capacity motor racing circuit in Buenos Aires, Argentina built in which year?
1957 1000 km Buenos Aires:  For this event, was moved from its previous venue, the Autódromo Municipal-Avenida Paz, only to return to the Autódromo in 1958. Autódromo Juan y Oscar Gálvez: The Autódromo de Buenos Aires Juan y Oscar Gálvez (official name) is a 45,000 capacity motor racing circuit in Buenos Aires, Argentina built in 1952 under president Juan Perón, named "Autódromo 17 de Octubre" after the date of Loyalty Day until Perón's overthrow.
i don't know