Conversation so far:
When were Henryk Górecki's first performances?
The first public performances of Henryk Górecki's music in Katowice in February 1958 programmed works clearly displaying the influence of Szymanowski and Bartók.
What did Henryk Górecki's first live performance lead to?
The event led to a commission to write for the Warsaw Autumn Festival.

Question: Did he perform in any festivals?
Self-contained rewrite: Did Henryk Górecki perform in any festivals?