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.
Did Henryk Górecki perform in any festivals?
At the 1960 Warsaw Autumn Festival, Henryk Górecki Scontri, written for orchestra, caused a sensation among critics due to its use of sharp contrasts and harsh articulations.

Question: Are there any other interesting aspects about this article?
Self-contained rewrite: Are there any other interesting aspects about Henryk Górecki's early modernist performances besides Katowice in 1958 and the 1960 Warsaw Autumn Festival.