How do Miles and his friends begin the pre-prank in "three days before"? How does Miles participate?

Miles and Takumi distract the Eagle by leaving a string of fireworks across the school grounds while Lara pours dye into the hair products of Kevin and his friends. Meanwhile, Chip and Alaska hack into the school's computer system, sending false reports of bad grades not only to the parents of Kevin but also to the parents of twenty-three other Weekday Warriors.