Parent power and kid power propelled hundreds of marchers through downtown streets Monday for the annual July 4 Darien-Norwalk Push-n-Pull Parade, exhibiting Darien’s and Norwalk’s cutest patriots in the national colors. The rules of the annual parade are simple: You can walk or ride in any kind of non-motorized, wheeled vehicle. At least one kid was on roller blades, many toddlers were in wagons, often resplendently furnished Radio Flyers, scooters were popular and there were bicycles. All got behind an honor guard from the Darien VFW Post, which led the parade, followed by The Spirit of Black Rock Fife and Drum Corps of Bridgeport, local officials (more on who, below), town resident Joe Warren, dressed as Uncle Sam, and the winners of several contests for their parade gear (more on that, below). Before the event, the paraders gathered in the parking lot at Goodwives Shopping Plaza, where they heard music from “Mary Ann Hall’s Music for Children and Beyond” — a children’s music school with classes at the Darien-Norwalk YWCA from fall through spring.