7. 4th of July
This is probably the least busy of the busiest times of year, but it also depends on which park you visit. Magic Kingdom puts on a special 4th of July display, which people absolutely love, and that makes it incredibly busy. In fact, the park has had closures on this day in the past. Epcot tacks on a special tribute to America at the end of its nightly fireworks display and the Voices of Liberty perform patriotic songs at the America Gardens Theatre. The other two parks don’t normally do anything special, so if you don’t want to brave the crowds then those are your best options for a park day.