Hanover school officials have moved up the starting time of Friday-night varsity football games to 4 from 7 p.m., according to head coach Christopher Landolfi. The change follows the discovery of the West Nile and eastern equine encephalitis viruses in mosquitoes collected in Hanover, and the recent death of a Weymouth resident from EEE. The local Board of Health has canceled events on town-owned property from sunset to sunrise as a precaution, and the School Department is following suit. “We probably won’t lift the ban until the first killing frost,” said Health Agent Anthony Marino. “If people are going to be outside at peak hours — especially at dusk — they need to use common-sense preventative measures.” Landolfi said that once the threat from mosquitoes has subsided, the starting time for games will be moved back to 7 p.m.