The Reference Desk/"Lady Di"

There's a really oblique reference to Lady Diana Spencer and Prince Charles' royal wedding at the start of TV: Father's Day, where Jackie says of her wedding to Peter, "It's good enough for Lady Di."

Is the Princess of Wales or the 1981 Royal Wedding identified as anything more specific in DWU stories? And if not, what's the best way of naming a clear real-world reference with no last name given in Father's Day?