Where do Miles and his friends go to discuss their plans for the pre-prank in "three days before"? How do they get past the Eagle?

After lying their way past the Eagle, who believes their story of going to visit Chip's mother, Miles and Takumi join Chip, Alaska and Lara in a ramshackle barn on the school grounds. There, Chip reveals the details of the plan, the role of each individual in the plan, and the necessary timing of each part of the plan.