Thanks everyone for your wonderful suggestions.
purplemuse, the idea of a mobile art project is great. We have many artists in the neighborhood who would be quite willing to participate. The people manning the float might look like they've participated in Jouvai by the end of the parade but, it's all in good fun. The idea of a Haiku Slam float is also just right for this place. thanks so much for your excellent suggestions.
Blue2000, you have the same sort of delightfully twisted mind I love! Old men playing chess with their grandchildren as the pieces is a wonderful idea. The idea of frisbee players could work with the dog walkers or the skate-boarders. Kudos to you! Unhappily, in my experience, joggers don't really want to make formations, they just want to make the finish line.
pvw: Are you old enough to remember the Hoo-Hah Parade? Back in the 1970s and 1980s it was a gentle thing that was put out in Pasadena to off-set the extravagance of the Rose Parade. There was a briefcase drill team but there were even more interesting units.
There was the lawn chair drill team. These men and women did their drills while opening and closing their folding chairs with the crisp precision of Philadelphia Steppers. The rhythm was amazing.
There was also the unit of 'Citizens With the Right to Bear Arms.' It sounds a bit militant but the arms these marchers were bearing weren't rifles. They were arms from old dress dummies. Imagine a formation in which the members of the team marched in a circle while their 'arms' clasped in the middle.
Thanks everybody for wonderful ideas. If we could only get together we'd have an astounding LAGFAW Parade.