Holding an event may mean a lot of work. All of a sudden you are likely to be struggling to meet deadlines and may even find yourself overwhelmed with all the tasks involved. The success of such an event may depend greatly on the planning process and knowing what you want to get out of the event.
If you come to look at the bigger picture, planning an event may yield a better overall outcome; achieving tasks on time and being able to correct problems before they become a huge issue.
In most cases, people hire professionals to hand their events avoiding all the hassles and the headaches.