What is the beginning date of this inaugural season of a new FIA Champoinship for electrically powered cars, in which the Buenos Aires ePrix was first raced?
2014–15 Formula E season The 2014–15 FIA Formula E season was the inaugural season of a new FIA championship for electrically powered cars. It began on 13 September 2014 at Beijing in China and finished on 28 June 2015 in London after eleven races. Nelson Piquet Jr. came first in the overall standings, and so became the first ever Formula E champion.
2011 24 Hours of Le Mans The 2011 24 Hours of Le Mans ("24 Heures du Mans 2011") was the 79th Grand Prix of Endurance, and took place on 11–12 June 2011 at the Circuit de la Sarthe, Le Mans, France, and organised by the Automobile Club de l'Ouest (ACO). It was the third round of the 2011 Intercontinental Le Mans Cup, and was part of a World Championship or International Cup for the first time since 1992, when it was part of the World Sportscar Championship. The race was attended by 249,500 spectators.