But I doubt it would happen.

Scavenger hunts and such are kind of a novelty thing. What CF would benefit from I my view is more storyline driven quests. Like Empire finally getting round to attempting a Balator takeover, locking Thrym in an imperial dungeon and taking over the orphanage to get cheaper cents for a week. But only if players participate. The following week could be the fortress liberating the orphans, the battle ragers jail breaking Thrym, etc.

I made a post a while ago suggesting there be some automated 'invasion' mechanic to spawn a bunch of mobs in an area of different ranks with a boss mob controlled by an imm so you could just push the orcs/skeletons/whatever button and have an event provided there's an imm that week who can put a few hours in to controlling a mob. Would take more initial work but could be epic. Mobs could be only aggro to those within 5 levels of themselves and come in different varieties for participation at different ranks. Lowbies could take out goblins/zombies, heroes could gang the warlord/lich guards, orcs could join the horde or choose to try to take over, etc

Or you know, storyline driven quests. But I think there is actually one of those going on right now it's just not clear how to participate.