The word "historic" refers to events or occurrences that are significant or important in history. It is used to describe events that have had a lasting impact or have shaped the course of history. On the other hand, "historical" refers to anything related to the past, including events, people, or objects. However, it does not necessarily imply that these things are significant or have had a major impact. Therefore, in the context of events, "historic" is the correct answer as it specifically denotes events of great importance or significance.