The Adventurer's Guild was organized and promoted by TSR from 1998 - 2000. Each play series, or season, lasted three months and included about six to twelve scenarios. Generally, scenarios were intended for convention play, and many were produced for convention tournament play.
The program was unusual because it featured scenarios for multiple role-playing game systems. Most scenarios were closely tied to a specific contemporaneous sourcebook or other product.
Note that most of these scenarios are rare (and correspondingly expensive). Several of the scenarios from the 1998 seasons have been re-published in TSR JAM 1999. Only a single scenario - Dragotha's Lair - has been subsequently re-published in PDF format.