Mass Violence Care Fund established. Creates the Mass Violence Care Fund as a subfund within the Criminal Injuries Compensation Fund for the purpose of reimbursing victims or claimants of mass violence, defined in the bill, for unreimbursed medical expenses related to a mass violence event, defined in the bill. The bill directs the Virginia Workers' Compensation Commission to promulgate guidelines and criteria for the payment of claims from the Mass Violence Care Fund within one year of the effective date of the bill.