Yes, on halloween the ghosts can get out of the house. Those kids died in the school and I would guess are free floating spirits that are not bound to a property. So when Tate did leave the house on Halloween they found him.
The ghosts are not trapped in the house but on the property, we have seen this many times, Hayden talking to Ben in the Gazebo, Hayden meeting Travis as he walks by the house, Tate on the porch, etc..
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