It was shown in a 70mm 6 track version in a cinema with a huge curved (ie proper 70mm screen).
What I remember most was that for some reason instead of closing the curtains after an teaser for another film in 35mm the screen just exploded in every direcuon into 70mm and the 20th century Fox intro ...it was just awe inspiring to hear that fabulous fanfare (which Fox had stopped using btw and GL brought back) as the screen exploded in every direction and then .....
total black and "in a galaxy far far away ...."
STAR WARS
and then the famous opening scene ....the audience gasped and cheered ...really cheered ....it was one of those moments in a cinema when the hair on the back of your head stands up!
Whatever GL does to SW ...I will always remember this ....I still have the program and tickets from that night!