none said:
Still a little confused what was shown opening day in the theaters which couldn't play the 35mm or 70mm Dolby Stereo version...
The mono engagements on opening day would just have been 35mm Dolby Stereo prints played back in mono, Dolby Stereo was and is mono compatible. Apparently 12 of the original 32 engagements on the 25th of May were presented that way.