This industry has so many different components that you would need to determine what aspect of event planning you would want to go into first.
For example, there is audio/visual, decor, linen, entertainment and of course, food! There are many colleges and universities that now have programs geared towards special events. However, getting a job at a restaurant, event venue or any place that would deal with or be involved with events would be a great place to start off in. It will allow you to get familiar with the details of the industry and see how things come together.
And once you have found your niche in this crazy world, be prepared! The spot lights shining over the new Cayman S, the sushi resting on the naked models back, the bride with tears of happiness in her eyes, is made possible by many early mornings, late night and very, very sore feet!