Maybe you should have a contest where for an update or two you challenge all other authors to only write about one celeb. Celeb a month type thing perhaps. Just a suggestion.
If I didn't think that'd be just one more project I'd fall behind on, I'd be game for that. A little more story-based participation around here might just liven the place up.
Conversely, considering our diminished population, perhaps lowering the requirements to, say, 25 Authors, but still 50 stories, would be reasonable? Just a thought.