I know I was late seeing The Trial, but the only theatrical showing I can positively name was during a Welles festival at USC in 1981. There might well have been an earlier one at some revival house, but I believe this was also my one time seeing Welles in person.
Which brings us to a nice easter egg on the Criterion release. They included something I was thrilled to find existed: the film that was taken of his generous hour-and-twenty-minute long Q&A session after the movie that night. I had completely forgotten there had been a small crew there filming it. I had also mis-remembered where I sat that particular evening, so it took me a lot of slo-moing and freeze-framing, but I finally found myself in the audience. I also had to go through pictures from around that time to prove, even to myself, that that guy is, in fact, moi. It's too bad the film ends before Welles gets up to leave, because I would have been visible walking up the aisle almost alongside of him, along with the few in his entourage, just enjoying the proximity for one brief shining moment.