There is a web site that gives conventions being held at the Orange County Convention Center but no central listing of events being held at the various WDW hotels. You might have some luck if you use a search engine like Google and enter your dates or month the name of the hotel and words convention or conference. Try something like "August 2002 Dolphin Disney". It may bring up the web site of the meeting's host if you want to satisfy your curiousity.
However, Deb & Bill's advice is right on the money. There is always a meeting or convention happening at S&D and the WDW Deluxe hotels. It's big business for them. Just read a report the other day that Orlando is the leader in the number of conferences and conventions, even beating out Chicago and Las Vegas. The size of the events is not as large as other cities but the numbers are high because they host so many at the individual resorts.