This position is done through the audition process. Everyone has a slightly different experience, but for the majority of us, we had 5 rounds during a one-day audition. The entire process was around 6 hours long. First-round usually starts with 100+ people in groups introducing yourself to the panel of recruiters, managers, and directors. If you don't show in the first round how fun, creative, and open you are you probably won't pass the first round. The rounds after very for every audition, but generally you will break into smaller groups as each round people are let go and you will have to answer difficult prompts and you are expected to respond happily and creatively. Creative lying is one way to think of it. These prompts are real questions that guests have asked and they are meant to stump you and throw you off your game. Since you have to have "character integrity" in this position you have to come up with creative ways to story tell a response that keep the magic and does not spoil the magic. Some rounds you were given an object to sell, like a ladder or a paper bag, and pitch to them why they need to buy the item. Some rounds you did a ping pong storytelling game where one person is given a prompt to start the story from the panel and collectively mesh your stories together as the panel points to each person to carry it on. Creativity and smiles are key for every round. They are seeing how well you react under pressure and how good you are at keeping the magic alive.
My group was offered the role after the 5th round. Others have said they received a call one or two weeks after the audition, and some have said they didn't receive their call for 3 months. You know you didn't get the role if you get an email saying they are seeking other candidates. If you really want to be an entertainment host but don't make it first time around then look into taking improve or theater classes. Most people who make it through are either theater majors, theater geeks, or are already cast members who have been trained very well in other areas of the park. First-hand experience dealing with guests can sometimes be really helpful with this role. Don't forget to have fun with it! They love to see smiles!