you can quote snopes all day but there exists a lot of people who saw that National TV show. The Johnny Carson show was what most of us watched at night. I recall looking forward to it b/c I was a Denver fan. The tape is edited or gone, it is that simple. The Carson people made it GO AWAY b/c of possibility of lawsuits from the DENVER people. I know it is difficult to believe ( especially in this day of hi technology) that someone just made something GO AWAY, but that is all that happened. Carson was a very powerful person. There may exist people at that concert that had tape recorders etc, but so far nothing has surfaced.
I had some friends who went to a country singer ( years ago ) and went up to meet him and offer him literature and he had them removed . He said jws were a cult. Now he did not do that from the stage but that actually happened. I know b/c I once met him and he asked about my religion and I told him I was trying to find a way to leave jws and he got very upset b/c he said they were a cult. I was not asked to leave -- I was offered the help of his microphone if i needed it. I was too naive to take him up on it.
Lots of things happened at concerts that no one ever finds out about. Get back in you WAY BACK machine and to a time that no one had cell phones or the Internet . There were recording devices but most were too cumbersome to take to a concert.