1967
Clark, Alfred E. “And in the Park It’s a Happening: 1,000 Hear a Work by Cage with Hoving as Host.” The New York Times (January 1, 1967).

https://www.nytimes.com/1967/01/01/archives/and-in-the-park-its-a-happening-1000-hear-a-work-by-cage-with.html