I've done the Americade parade a couple of times . They plan it so the bikes move at a relatively smooth pace without any stops or clutching. They travel two by two up to one end of town then turn and head the other way so the paraders get to watch the other members as they go by. The crowd gets to see it all.
If you've never done it its worth doing once. They have a local radio station play marching band music and everyone with a radio on their bike tunes in the station so that theres marching band music throughout the parade. Very well thought out. Anyway thats really the only way you'd want to do a parade.
Of course we did once have a custom bike shop enter one of our local parades once. The guy had his girl friend ride her custom chopper through the village in nothing but a thong bikini. The dad's LOVED it ,the mon's weren't anywhere near as appreciative.LOL! To be truthful though, the young lady was very attractive but unfortunately it only reinforce the negative biker image that many of us have been trying to quiet for years.