The Mackinac Bridge Tower Tour is offered by certificate which is in general not sold to the public. A limited number is distributed each year, with many being given to VIP visits. An auction will be held at the Bridging History Event to one of these exclusive certificates. Each certificate is authorized for two persons, a winner and a guest, to travel to the top of the tower. Only event guests are eligible for auction participation. Tickets to the Bridging History Event are available here.