Prince Harry will also be present with representatives from Contact, a military mental health charity group.
Harry learned first hand about the massive 1940 operation to save hundreds of thousands of servicemen from advancing Nazi forces when he met men who had been on the French beaches.
"It just reminded me when we were just outside Dunkirk we were mortared as we were getting away", Mr Wagner said.
Christopher also praised Harry's acting skills. Harry Styles can act people!
- Steven Weintraub (@colliderfrosty) July 10, 2017Harry Styles & DUNKIRK cast deliver powerful performances as they react to the insane practical effects & sets. I'd do this one again but it may be one and done - I'd do this one again.
Earlier this month, Nolan told ET that Styles was "perfect for this part", adding, "What I was seeing [when he auditioned] was a very charismatic guy who clearly had a truthfulness and a subtlety in his ability to perform as a film actor".
"I did and I loved it", the filmmaker told Yahoo Movies at the Los Angeles press day for his new Warners-released WWII thriller, Dunkirk (watch above).