Help me with this please!!!!!!!!!

[matthews]

Hello! I'm from Argentina and I have a doubt that I would like you to help me about.
Someone is betting me that CCR came to my country (Argentina,
exactly at Rosario city) on the early 70's. This guy says that
they came for a Carnival celebrated in a club called Gimnasia y
Esgrima. Do you have any information to corroborate this story? I
think that it's fake, I'm a CCR big fan and I don't believe the
story that this guy is trying to sell to me. I'll wait for your
answer, thank you very much!!!!!! Matias