At the present time, the concerts scheduled at Centro Cultural Kirchner are being held in the Sala Argentina on the lower level.
Proof of vaccination is not required to attend concerts in the Sala Argentina.
However, I found the following information as it pertains to the Auditorio Nacional:
Entrance to the National Auditorium
COVID-19 - Sanitary Pass
Any person who has reached the age of 13 and who attends the concerts at the National Auditorium must prove that they have a complete vaccination schedule against COVID-19, applied at least 14 days before the event.
This means I will not be attending any concerts by the Orquesta Sinfonica Nacional and others in the National Auditorium.
Teatro Colon has no mandatory vaccination requirement for attending concerts.
"The correct use of a face mask is mandatory before and during the event, covering the nose and mouth."
Friends in Germany will visit Buenos Aires in July, and concerts at both venues are on their agenda.