I love you, Trion, but you're good for making the same mistakes at the start of each new world event or weekend deal.
A guildie had a nice suggestion: PTR the *event rules*. Trion must know ahead of time how they're going to do something, at least roughly. They also must know by now that people have lots of questions, and want to know these things.
Why not release notes several days in advance, allow players to respond and ask questions, and actively monitor and respond within the official topic? Then, when the event comes, you have a full list of comprehensive rules right off the bat you can post and put on the website.