The grand drain water off ceremony in Dujiangyan will be opened on April 4 in the Tomb-sweeping Day. The archaized sacrifice ceremony, folk and cultural activities, festival business trade, investment and sales promotion and stimulus activities are all going to be held on April 4 which can be as good as the same festival in the last year. During that period, more than 100 foreign ambassadors and experts on folklore will be attended for the water draining off festival.