The only way to remind them it to say, "You know, its the contest Arnold Schwarzenegger competed in" and they usually remember. Even then, they still look confused lol.
Ha, indeed, I've never known anyone but a hardened gym rat that knows "The Olympia" is actually "The Olympia". Mr.USA, Mr. America, and Mr. Olympia are all interchangeable, and are one in the same to most people.