According to a local Cordoba newspaper the spectator locations are 6: San Francisco del Chañar (hora 9.40) and Caminiaga (10.35) only trucks .
Churqui Cañada (13.20), Los Pozos (14.00), Villa Albertina (14.30) y Cañada de Río Pinto (14.35) for bikes, quads and cars.
Get to those areas and then follow the crowds...
. Google maps is your friend.