Good grief, this Chinese New Year business sure does go on for a long time. This weekend, it's a New Year Parade and a New Year Community Fair that'll be tying up traffic. A ton of major east-west lines will be affected on Saturday afternoon -- the 5, the 71, the 38, the F, the 1, and so on. Also causing trouble: the weather. Muni can barely keep its head above water when it's dry,......