1) My parents took me on a birthday surprise visit to The Dominion theatre in London to see ROTJ in 1983. The experience was furthered by a visit to Hamleys (the world's biggest toy shop!) to stock up on LOTS of new figures and ships!
2) I saw the OT back to back at Elstree in 1993(?). It was the last official Lucasfilm approved showing of the OT before the SE's were released. There was even a message from Lucas himself.
JD