1971-07-05 Milan Information
Luis Rey reports the date as July 3 while Lewis & Pallett report July 5. Notably, Lewis & Pallett's book shows an Italian newspaper clipping dated July 6 regarding the infamous performance. July 5 seems to be correct.

Cross References:
1969-03-15 Short Cuts (Image Quality)
1971-08-07 Casino Royale (Empress Valley)
1972-11-30 Stepmothers Club (Mad Dogs)