So far the best I've come up with is "A Ceres of Unfortunate Events," but I'm thinking of that as a section title rather than a main title, for the bit where I explain what the adventure's about.
I may also nick Asimov's article title "The World Ceres," but again that works better for a section than the overall title.
Any other suggestions?
Later: Thanks everyone, I think that's enough for the time being!
Later still: vaguely surprised nobody suggested Ceres and parallel...