There are several big duck races held around the world. In these events, people buy a duck ("Adopt-a-Duck") and put their name on it. Then all the ducks are thrown into the river, and the first duck across the line downstream is the winner. The money raised from selling the ducks goes to charities.
The Great Singapore Duck Race is one of the biggest, with 85,000 rubber ducks taking to the Singapore River, raising in excess of $1 Million for local charities.
In September 2007, The Great British Duck Race on the River Thames smashed the Guinness World Record for the 'World's Biggest Charity Duck Race,' with 165,000 ducks, beating the previous record by the Singapore Event which raced 123,500 ducks in 2001.