Historic is an adjective that means something famous, important or influential in history.
- She returned safely from her historic flight into space.
- It’s wonderful to see so many people here on this historic occasion.
Historical event is something that happened in the past. This is an adjective that refers to anything from the past, important or not.
- He strove for historical accuracy in the movie.
- The kings are listed in historical order.
“Any past event is historical, but only the most memorable ones are historic.”