San Francisco Opera performance archive, https://archive.sfopera.com/salome/1974 : Salome, 1974 season, War Memorial Opera House, cond. Otmar Suitner; show dates 22/28 Sep, 1/4/12 Oct 1974, with "Broadcast Fri, Oct 4 1974 -- 10/4/1974, live broadcast, KKHI". The same archive lists Suitner conducting no Salome in any other season (14 of 14 SFO credits, 1969-1982), so 1975 cannot be right; day 4 / month 10 already held were correct. Cast on that page matches the record exactly (Rysanek, Varnay, Nimsgern, Hopf, Neill, Garabedian). Orchestra/chorus added from the same page.

Migration: a zero year, month, day or OperaClass id meant the value was unknown, not that it was zero. Set to null.