 On 22 August 1951 , the unions held a mass rally of two million people called " Cabildo Abierto . " ( The name " Cabildo Abierto " was a reference and tribute to the first local Argentine government of the May Revolution , in 1810 . ) The Peróns addressed the crowd from the balcony of a huge scaffolding set up on the <unk> 9 de Julio , several blocks away from the Casa Rosada , the official government house of Argentina . <unk> were two large portraits of Eva and Juan Perón . It has been claimed that " Cabildo Abierto " was the largest public display of support in history for a female political figure . 
