Well, depending on what kind of event you are holding there are several free online job posting sites, or you can resort to looking for an event planner through their own websites by opting out of placing an ad. There are several different ways to look for an event photographer, but posting on craigslist, newspapers, college campus job boards and more will help you get started. When you post the ad take a look around and see if this is where you would hire someone if you saw them walk up to you right now. Be aware of your surroundings, and if you post with an internet site or newspaper ask if they offer an anonymous response email or phone number for your privacy.