“An event devised by Billy Klüver and Robert Rauschenberg that took place October 13-23, 1966, in the Armory of the 69th Regiment in New York. The performances involved ten artists, musicians, and dancers; thirty engineers; and an audience of ten thousand.”
(source: White Heat Cold Logic, p. 75)

Legendary series of theater, dance, music and performances at the New York 69th Regiment Armory in 1966 by 10 New York artists: Robert Rauschenberg, John Cage, David Tudor, Yvonne Rainer, Deborah Hay, Robert Whitman, Steve Paxton, Alex Hay, Lucinda Childs and Öyvind Fahlström.

In 1966 10 New York artists worked with 30 engineers and scientists from the world renowned Bell Telephone Laboratories to create groundbreaking performances that incorporated new technology. Video projection, wireless sound transmission, and Doppler sonar – technologies that are commonplace today – had never been seen in the art of the 60’s.

(quoted from http://www.9evenings.org/)

See http://www.9evenings.org/ for a documentary DVD Series currently in production.