There used to be a great small-fandom exchange (Night On Fic Mountain) that ran so that reveals were on the northern summer solstice (or winter solstice in the southern hemisphere), and that suited me perfectly. It was essentially Yuletide, in the other half of the year. But I think they ran into problems matching people, since the volume of participants was never as high as in Yuletide, and it got too stressful trying to get people to write for pinch hits, and so it doesn't run any more. But it was perfect for me!