Some years ago I took part in the Write a Book in a Day challenge at the behest of the Katharine Susannah Prichard Writers Centre: a group of writers and artists, locked together in a room, with a single aim-- to turn a bunch of blank pages into a printed, illustrated book in 24 hours.
Sometimes, we get together and cry.
In all seriousness, it's a brilliant concept. It's huge buckets of fun for the creators, it raises valuable money for the recipients, and there genuinely is not a single loser along the way. It is one of the few everybody wins concepts going around.
This year, the Canberra Speculative Fiction Guild is taking part for the second year. The equation is simple: get on it. do some good. Make writers cry.