Peter Debruge Chief Film CriticCANNES — The awards show for the 75th anniversary Cannes Film Festival is underway, bringing 12 days of competition between 21 international features to a close. “Benedetta” star Virginie Efira is hosting, while several directors can be spotted in the audience waiting to receive their awards, including Claire Denis (“Stars at Noon”), Park Chan-wook (“Decision to Leave”) and Belgian brothers Jean-Pierre and Luc Dardenne (“Tori & Lokita”).Guillaume Canet presented best actress honors to Zar Amir-Ebrahimi, who plays the reporter who risks her own life to catch a serial killer in “Holy Spider.” The tense true-crime thriller exposes the crimes and aftermath of a man who targeted prostitutes, and that portion of society which accepted his religious justifications he claimed for cleaning the streets.