American film star Grace Kelly was married to Rainier of Monaco. Where did they meet?

Explanation

Grace Patricia Kelly (November 12, 1929 - September 14, 1982) was an American actress who later married Rainier III, Prince of Monaco. They met when Kelly headed the US delegation at the Cannes Film Festival in April 1955. While there, she was invited to participate in a photo session at the Palace of Monaco with the prince. After a series of delays and complications, they finally met.