After a power outage threatened to delay Saturday's closing ceremonies of the 78th Cannes Film Festival, the event at the Grand Théâtre Lumière went off without a hitch.

Judging by the enthusiastic audience applause, Julia Ducournau’s Alpha, Mascha Schilinski’s Sound of Falling, Jafar Panahi’s Simple Accident, Oliver Laxe’s Sirât, and Saeed Roustaee’s Women and Child...