Conversation so far:
When were Henryk Górecki's first performances?
The first public performances of Gorecki's music in Katowice in February 1958 programmed works clearly displaying the influence of Szymanowski and Bartok.
What did this event lead to?
The Silesian State Philharmonic in Katowice held a concert devoted entirely to the 24-year-old Gorecki's music.

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