In a photo provided by Elias Djemil-Matassov, Betty Bonifassi in “Slav,” part of the Montreal International Jazz Festival. The production was canceled after detractors accused its creators of cultural appropriation. (Elias Djemil-Matassov via The New York Times) -- NO SALES; FOR EDITORIAL USE ONLY WITH THEATER MONTREAL UPROAR BY DAN BILEFSKY FOR JULY 5, 2018. ALL OTHER USE PROHIBITED. --