Conversation so far:
What role did Alexander Vasilyevich Alexandrov play in the peace concert?
Alexandrov Ensemble was chosen to perform at the concert at Gendarmenmarkt following World War II.
When was the peace concert performed by the Alexandrov Ensemble held?
The Peace Concert was held in 1948.
Who organized the 1948 Peace Concert?
An American officer suggested a concert in the Gendarmenmarkt, and the French zone commander supported the suggestion. The musicians were to be provided by the USSR.

Question: How many people attended the concert?
Self-contained rewrite: How many people attended the Alexandrov Ensemble Peace Concert?