And as for other BDEs we've had over the years-- Zombies, Labyrinth, Needful Things. We had a Skullcrusher Mountain BDE, and Nemesis Island, and a Mario one, though some of those are going to have to be run by the people who ran them first for permission to revist them, I imagine.
How long were you thinking of having this run? There was the BDE where reality was tearing and people were thrust into their own personal AU selves that ran for quite some time, but I know some people were starting to feel AU fatigue and just wanted to get back to their own characters before the end of it, so you'd also probably want to take that into consideration when planning out the gap weeks to avoid burnout.
Re: Specific Ideas!
How long were you thinking of having this run? There was the BDE where reality was tearing and people were thrust into their own personal AU selves that ran for quite some time, but I know some people were starting to feel AU fatigue and just wanted to get back to their own characters before the end of it, so you'd also probably want to take that into consideration when planning out the gap weeks to avoid burnout.