Reflection is a powerful tool in your quest for success. It doesn't matter if you are a leader or just a member of the team, nor does it matter what your profession is. You should introduce reflection into your routine, for both big events and in your daily life. Successful people and organizations take advantage of the power for reflection.
For your job, after every event reflect back on what you wanted to accomplish, what you actually accomplished and how you can improve. This can become even more powerful if you include the people who played a part, whether planning or execution, in the event. Even if the event went well, you can almost always find ways to do better.
For your personal life, make reflection a daily habit. Get into the routine of making one of the last things you do each day before you go to bed is reflecting back on what you did that day; activities, decisions, actions, etc. and figure out how to do them better tomorrow.
The secret is you must be brutally honest with yourself and/or team members if you truly want reflection to work. If you are not honest, then you are wasting your time. I promise if you add honest reflection to your personal and professional life you will immediately see the benefits.