Have the whole jackass gang dress-up like old men or women (their choice). Divide everyone into two teams and set-up two forts across the street from each other. Just have an all out war. Toss food or what ever you got and cuss like no tomorrow. Of course have permits so you don't get arrested. When people ask what this is about give them different answers, for example say they stole your cane or they took the last cup of prune juice.