Actually, I would like to see more events that require the whole server to help each other complete (like the TTs mentioned above), and the first server to complete it gets a new game feature. Then a month or two later the feature would be released to all other servers.
It's more fun that way than just trying to do an event for personal equipment (Halloween Staff, etc.).
Edit: For those of you who weren't there for the Twinkling Treants event in late 2003, this is what happened:
Now, I can't remember if this is 100% accurate, so someone correct me if I'm wrong.
Back then, there were no Outpost Warps. You can only set your HP and buy items from NPCs at the outposts. In December 2003, they added the "Twinkling Treants" event. There was one those tree mobs (like the ones that drop Tree Cuttings) in almost every outdoor area. They were called Twinkling Treants, and the difference was that these TTs were sparkling with different colors, like a Christmas tree. Each of them had 1,000,000 HP. The only way you could attack it is if you were level 20 or less. Players above level 20 can talk to a special Moogle NPC to temporarily lower your level to 20. So as you can imagine, it takes a LOT of time for level 20 players to take down 1 mil HP, not to mention there were several of these TTs scattered throughout the world.
Your goal is to defeat all these TTs before New Year's day.
On the FFXI official site, there was sort of a live update that shows you how close each server was to defeating all TTs.
The reward for completing this event was that the first server to complete it would gain a new game feature: The Outpost Warp.
I forgot which server was the winner.
Not long after that server got the OP Warp (a few weeks?), though, SE gave OP Warp to all other servers.
I think that's pretty accurate for what happened. This is the type of event I would like to see more of. Server-wide reward that everyone can benefit from, as well as bragging rights for your server being the first one to complete the event.
Edited, Jan 25th 2010 1:15pm by Threx