Gauchos of Lago Puelo
On our way to Lago Puelo park, we happened upon a Tradition Day celebration, where we watched the local horsemen and their families carry on the gaucho traditions of horsemanship.
Tradition Day (Dia de la Tradicion) is Argentina's great gaucho festival. According to the World Events Guide: The day falls on the anniversary of the birth of Jose Hernandez, one of the nation's most important poets who highlighted the injustices and hardships of the common people of his day. Tradition Day is the climax of a week or so of parties, concerts, gaucho parades, traditional music, feasts and other festivities across the country.
For more see the Argentina government site, which includes a biography of José Hernández.