Once a year on Freedom and once a year on Epic, one player is chosen (say, based on Valrei).
That player gets to ride the Wurm for one day or so.
On Freedom, of course, it would be a massive event, because it only happens once a year, and on Epic, it could be a once-in-a-year chance to (finally) do some massive damage to enemy deeds, like their capital on Elevation.
When things like events and interesting player-made occurrences happen, people make threads about them, look forward to them and talk about them for years.
I propose that this happens!