Well, the main point of this event was to open the second part of Book 14, Chapter 7 to players, so if you're to that point, you can now proceed. As far as the event repeating, there's no official word on that, yet Turbine may take the overwhelming participation in this event as a learning experience for future events. Currently you can't get any more ring-lore, yet the Heralds of Rivendell are still scattered throughout Middle-earth. So this begs the question: would you want another of these events? What type would you like to see?