LANCASTER, Calif.—The 2021 Antelope Valley Fair, which was scheduled to begin on Oct. 1, was canceled, organizers announced Sept. 17, saying that new mandates from the Los Angeles County Department of Public Health caused too many logistical problems. The Los Angeles Department of Public Health announced on Wednesday that effective Oct. 7, outdoor events with more than 10,000 people must require proof of vaccination or a negative COVID-19 test within 72 hours. The fair typically takes place over 10 days in August but was moved to eight days in October to accommodate COVID-19 health and safety protocols and mandates. The event also was also scaled back to have a reduced number of vendors, exhibitors, and concessionaires, and the arena concert series was already canceled. “While our staff and volunteers have made countless changes and efforts to hold this event safely, the continued obstacles Los Angeles County Health Department imposes on …