The first David Bowie concert I saw, was during his 1978 "Stage" tour. It was an indoor concert and there was so much weed being smoked by so many people, there was a constant, hazy fog throughout the venue for the entire show. I think it was more like going to an indoor hemp festival and having a David Bowie concert occur than going to a David Bowie concert where a hemp festival occurred.
It sure was fun, though!