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Invitation to the press briefing for “9 Evenings: Theater and Engineering,” to be held at Robert ������’s 381 Lafayette Street studio. Signed by Alex Hay, Deborah Hay, Steve Paxton, Cecil Coker, Billy Klüver, Peter Hirsch, Per Biorn, Bob Kieronski, Bob ������, Öyvind Fahlström, L.J. Robinson, Yvonne Rainer, Lucinda Childs, David Tudor, Fred Waldhauer, John Cage, Dick Wolff, and possibly Robert Whitman