Any ideas, please

We finally have our dog community park and there will be a celebration to raise funds for the fence. The theme will be 'Woodstock' and I don't have any idea of how to dress my furkids. They won't stand for the sunglasses-typical of the 60's. What else can I do?
The park is in Paradise Township @ Skywood Park in Poconos, PA on October 10 from 9 am- 5 pm., in case anyone wants to come