Evanston Township High School (ETHS), located 14 miles north of Chicago, unexpectedly suspended all operations following a ransomware attack identified on Sunday, June 71. The Illinois high school announced a complete closure for Monday and Tuesday, with a projected reopening no earlier than Wednesday. This significant disruption not only halted all scheduled classes but also impacted critical summer programs, including summer school, various athletic camps, and all other on-campus activities, which were subsequently canceled. Upon detecting the cybersecurity incident, ETHS immediately activated its comprehensive incident response procedures to contain the threat and assess the damage. The school also promptly engaged external cyber breach attorneys and specialized cybersecurity forensic experts to lead the complex forensic investigation and manage the data recovery process. This event highlights the severe operational risks ransomware poses to educational institutions, illustrating how a single cyberattack can instantly cripple essential services and cause widespread functional interruptions for students, staff, and the wider community.