National Lake Festival in El Calafate
El Calafate's national festival, commemorating the 1877 baptism of Lago Argentino by surveyor and explorer Francisco Moreno, combines an active lakeside sports program — kitesurfing, triathlon, beach volleyball — with evening concerts at the purpose-built Anfiteatro del Bosque, drawing both dedicated attendees and travelers passing through en route to the nearby Perito Moreno Glacier.
El Calafate's biggest festival marks a specific historical date rather than a harvest or a season: February 15, 1877, the day surveyor and explorer Francisco Pascasio Moreno formally baptized Lago Argentino, the glacial lake the town sits beside.