There are plenty of societies who would be only too glad to come to your organization to do displays. Two of these that Im familiar with are vintage car societies and the pony & trap enthusiasts.
You can charge $10 for entry so that people can get up close to the displays. These events are usually well attended and take little or no organization. Usually the society just turns up and you put on a gate. Its an easy $1000 if you get 100 people attending. You can make a little extra by having a raffle (a ride on one of the traps or one of the vehicles makes a great prize). A novel item indeed, for your list of fundraising events.