Deptford Township School District has canceled classes Friday because of an unmanageable number of staff absences, the superintendent announced Thursday night. The closure in the district in Sewell, New Jersey, is “due to a greater number of staff callouts than expected,” making it difficult to operate on Friday, a letter from Superintendent Kevin Kanauss said. District leaders intended to keep schools open even with many opting to attend the Eagles’ Super Bowl celebration parade in Philadelphia but made a last-minute decision to close, the letter says: “We know that many students and staff have been planning to attend.