I may or may not have correctly remembered TV cameras that weekend -- and who knows, maybe some individual bands were doing it -- but I do remember Arlo saying that he hadn't been singing the song for a while but had started again. He said he wanted us to sing the chorus loud enough for them to hear us in the US. Something to do with a system to register for the draft in the States that annoyed him. Was the post office/ draft thing around that time? (August 1 to 3, 1980 -- I have the poster framed on my office wall. Ah, those were the days . . .)