After 21 world premieres, nearly two weeks of red-carpet parades and hundreds of thousands of camera flashes, the 76th Cannes Film Festival concludes Saturday with the presentation of its top prize, the Palme d’Or. One of cinema’s most sought-after awards will be decided by this year’s jury, presided by two-time Palme winner Ruben Östlund, the Swedish director. The brief ceremony will precede the festival’s closing night film, the Pixar animation “Elemental.” Any of the 21 films that played in Cannes’ main competition lineup can win the Palme. Among the critical favorites of this year’s festival are Jonathan Glazer’s “The Zone of Interest,” the deadpan Finnish romance “Fallen Leaves,” and the French courtroom drama “Anatomy of a Fall."