As he came past me, over one of the white picket fences decorating the backstage area, I said "good show". To this, someone laughed. But Snoop turned around and said "thanks", (although it was rather quiet, so it might easily have been a grunt). Nonetheless, I was satisfied.
The gig before ours - or event, would be more accurate a word - was a talk by Professor Brian Cox of Manchester University. I met him afterwards and we took a picture together; my later tweet said "science meets music," but then he was a musician previously, so that has already been done.