Jordan Firstman ’s Club Kid found the beat during the film’s world premiere at the Cannes Film Festival on Friday afternoon, dancing its way to an electric seven-minute standing ovation. Firstman, in a first as writer-director-executive producer and star, soaked in the attention while hugging his stars, including Diego Calva and Cara Delevingne. The 126-minute film premiered in the festival’s Un Certain Regard selection. Club Kid casts Firstman as a washed-up party promoter who is forced to turn his life around when an unexpected visitor arrives — his 10-year-old son. Eldar Isgandarov and Reggie Absolom also star. “Any gay people in the house? Okay, the door is that way. You’re not welcome here. We’re gonna have to ask you how to leave the straight-only audience, please,” Firstman joked before the screening. “I’m so fucking happy right now. This is such a dream come true.…