From the included article published in the Saskatoon Phoenix on August 21, 1982, you can see that the paper advertises a Peter Tosh/Jimmy Cliff show on September 3, 1982 at the Saskatoon Centennial Auditorium.
Live Performances, Peter Tosh, Press Archives, Roots and Culture
LEGENDARY REGGAE 
Cool! I was there and now many years later I Googled the concert to remember what exactly I saw way back then and come across your page. Thanks for the effort!