Members of the SOUTH RIVER GARDENS COMMUNITY ASSOCIATION would probably love to host art fairs and festivals like other neighborhood groups do. Instead, they're forced to spend their time and energy fighting their smelly neighbor, Live Oak landfill, which is just north of the neighborhood, where Moreland Avenue meets I-20. Residents of South River Gardens, a neighborhood of about 550 single-family homes, were instrumental in getting Gov. Roy Barnes to order Live Oak to shut down during the summer of 2001. And they continue the fight. They hired an attorney to make sure Live Oak actually does close. Its operators, Waste Management Inc., appealed the mandate. A judge's decision should come by the end of the year.