If you are unfamiliar with Advanced Dungeons & Dragons (AD&D) (or role-playing games in general) you may wish to visit Yahoo's collection of relevant links at: Recreation:Games:Role Playing Games. Basically, it's interactive fiction.

Reunicon tournaments are generally played as 2 or 3 teams of characters playing the same adventure. The winning team is judged by the DMs with a scoring system that varies from year-to-year.