When you're selecting a photographer for an important event, you're really making a decision about who to place your trust in. Who will have the eye to recognize the essential moment when it arrives? Who will bring the preparation and technical skill necessary to capture and draw out the full potential of this moment? Events can be repeated (you can renew wedding vows again and again), but each event exists in a unique point in time, and when it's gone, it can't be revived. Photographers only get one opportunity, so they better be able to grab it.