The International Congress of the European Hernia Society is the largest of the events, with 1,500 delegates expected to arrive in Edinburgh in November 2011.
Edinburgh has won conferences worth a total of £56.4m in the current financial year and the ECB is confident of hitting its £73.9m target.
ECB chief executive Sue Stuart said: "The past 12 months have been challenging but we have helped deliver significant economic benefit for the city. I can confirm that we are on track to meet our target of achieving economic value of £73.9m for the city. We also saw our world ranking as a global destination improve this year from 28th to 36th."