From the introduction:
We welcome you to our Greyhawk Reborn (GHR) organized play campaign. Our primary goal is entertainment for everyone involved, players and DMs alike, while advocating for the gaming community.
Greyhawk Reborn is a new type of living campaign, one in which adventures are created and judged by each individual DM. At the same time, the campaign staff manages the campaign guidelines and documents and oversees the campaign story lines. We are using the Dungeons and Dragons 5E as a basis for our Greyhawk Reborn campaign. However, where there a differences between the D&D 5E rules and GHR campaign, the rules in this document have precedence.
One of the main goals of the Greyhawk Reborn campaign is to bring gamers together. As such, it will primarily be offered at conventions and game days. We believe that the more often gamers get together, and the greater numbers of gamers that get together, the greater the benefits to the gaming community overall.
Please keep in mind that the Greyhawk Reborn campaign will constantly strive to provide the best play experiences possible for our players. We will tweak, change and maybe even overhaul things to improve our campaign.
Understand that the rules in this document, and other Greyhawk Reborn documents to follow, may always be changed or tweaked, whether to adjust to rules updates, allow for better game balance, or simply to create more player enjoyment.