D.W. wants to help out at Aunt Lucy's wedding, but she is too little. Arthur is the ringbearer and their rude cousin Cora is the flower girl. During the wedding, Cora distracts Arthur, causing him to accidentally throw the ring into the organ pipes. Arthur is too big to crawl into the organ and Cora does not want to get dirty. D.W. volunteers and successfully retrieves the ring. As a reward, Aunt Lucy allows D.W. to be both the ringbearer and the flower girl. When Arthur complains about the state of the park, his father starts a brigade for Arthur and his friends to clean the park. Arthur's friends get angry at him for starting the brigade, despite him trying to explain that it was his father's idea, not his. As a result, Arthur has to do the job himself with only Francine's father advising him. However, the next day, Arthur stands up to Binky and his gang when they tease him and orders them to help him clean the park. Arthur's friends decide to help him after overhearing the incident with Binky's gang.