Within 60 days after October 1, 1975 (the effective date of Public Act 79-794), the Mayor of Danville, with the advice and consent of the Danville city council, shall appoint 9 members of the board, 3 members to be appointed for terms of 1 year, 3 members to be appointed for terms of 2 years, and 3 members to be appointed for terms of 3 years, such terms commencing on the date each is appointed. Within 60 days after September 11, 1989 (the effective date of Public Act 86-907), the chairman of the county board of Vermilion County, with the advice and consent of the county board, shall appoint 3 members to the Vermilion County Metropolitan Exposition, Auditorium and Office Building Board to serve for terms of one, 2, or 3 years, respectively, such terms commencing on the date each is appointed. At the expiration of the term of any member, his successor shall be appointed by the Mayor of Danville or the chairman of the county board of Vermilion County, as the case may be, in like manner. All successors shall hold office for a term of 3 years from the date of appointment, except in case of an appointment to fill a vacancy.