( CNN ) -- London 2012 Olympic organizers said Wednesday they oversold thousands of tickets for the synchronized swimming events at this summer 's Games . The committee said it discovered the error while comparing final seating configurations at Olympic and Paralympic venues against the millions of ticket orders placed . They found that four synchronized swimming sessions were oversold . Organizers last month contacted around 3,000 customers who had applied for tickets to the four sessions and told them of the error . `` We are exchanging their synchronized swimming tickets for tickets in other sports that they originally applied for , '' a London 2012 spokesman said in a statement . It was not immediately clear whether the committee discovered oversold tickets in other events . The newly-built Aquatics Center , with its giant wave-like roof , is located at the Olympic Park and will play host to synchronized swimming and other water sports , including swimming and diving . The majority of spectators for those events will be seated in two temporary wings that will be taken down after the Games , the committee said . The London Olympics are scheduled to take place July 27 through August 12 . The Paralympics go from August 29 to September 9 .
The error affects four synchronized swimming events . About 3,000 customers were told of the error . The Olympics are scheduled to open July 27 .