Lucas will be joined on the red carpet by stars Hayden Christensen and Natalie Portman, who is sporting a new shaved hairstyle in preparation for her next movie.
Samuel L Jackson is also at the French resort to support the movie, in which he plays Jedi Mace Windu.
He likened Lucas to Quentin Tarantino, who directed him in previous Palme d'Or winner Pulp Fiction.
He said: "They both give me a lot of freedom to do what I want to do.
"They know I'm going to come with a lot of things to do the best job I can.
"They are both guys who know exactly what they want to do, and how they want it done, and explain that very clearly.
He added: "They are almost the same guy, but one of them is loud and the other one is not."