Floating wine cup along winding water

The most famous "floating wine cup" activity in ancient China shall be the one held in Lanting of Shaoxing City on March 3rd, 353 A.D. On that day, Wang Xizhi, the famous calligrapher, held a get-together with many talents by the Jiudian Pool. They each sat on the ground by the bank, with a wine cup put into the upper stretch of the water, floating and winding downstream. As the rule goes, once the cup stopped moving in front anyone, he should take it for a drink and improvise a poem.