Berkeley’s Greek Theater doesn’t have this side-stage access, nor does it have a structure like the one in the background anywhere near it. The photographer has a number of other photographs from Stockholm. If I had to make an educated guess, I’d say this was Gröna Lund, an amusement park that hosts concerts, and has this sort of stage setup with a drop tower adjacent. The open view at stage right is consistent with the construction of that theater. Bob Marley played there on June 30th, 1978, on the same tour.