Conversation so far:
what did Leonard Bernstein have to do with social activism?
Bernstein would go on to fight for everything from the influences of "American Music" to the disarming of western nuclear weapons.
Are there any other interesting aspects about this article?
He was blacklisted by the US State Department and CBS in the early 1950s.
what was he blacklisted for?
Bernstein had been involved in various left wing causes.
are there examples of any?
Bernstein and his wife held the event seeking to raise awareness and money for the defense of several members of the Black Panther.

Question: which event did they hold?
Self-contained rewrite: which event did Leonard Bernstein and Bernstein's wife hold to defend members of the Black Panther?