I curse my ADHD mind for constantly pondering and hyperfixating a lot.
What about an event that revolves around the Ashen Winds? The Ritual is constantly summoning and re-summoning Ashen Lords to no avail (because players kill them over and over, and that's it). If the Ashen Winds event goes too long without being intercepted, what if the Ritual completes and the Ashen Lord actually starts sailing the seas on a weaker, flaming ship similar to The Burning Blade? It's uncapturable, and you actually have a little bit more interaction with an Ashen Lord rather than just beating them up on an island all the time.
