No, you do not have to pay for a 1-year-old to attend a Disney Halloween party, such as Mickey's Not-So-Scary Halloween Party at Walt Disney World. Disney's standard policy for all theme park admission and special ticketed events is that children under the age of 3 are admitted for free. They do not require a ticket and can enter the event simply by being accompanied by a ticketed adult. This makes the party a relatively good value for families with very young toddlers, as they can participate in trick-or-treating, meet characters, and watch the exclusive "Boo-to-You" parade without an additional financial burden. However, parents should keep in mind that these parties run late into the night (often until midnight) and involve loud music and intense lighting effects, so bringing a 1-year-old requires careful planning regarding strollers and noise protection.