Last year I succeeded in the challenge to write, draw and publish a 24 page comic in 24 Hours.
24-Hour Comics Day is now in its 22nd year? originally a challenge from Scott McCloud to Steve Bissett, it's now an international event, with comic shops, libraries and schools opening up to support challengers. It sounds easy, 24 hours to draw a comic, but that 24 hours includes everything, creating the story, pencilling, inking, lettering, colouring layout and printing (or posting to the web), everything.
The 24 hours are continuous, you can rest but the clock doesn't stop.
The first year I tried I failed dismally and stopped (the "Gaimen variation"), but last year was far better, I bought in paper, biscuits, coffee, and pens, and cracked on.
This year I'm hoping to do a story related to the Wychwolf webcomic I draw.
Obviously it isn't in the spirit of the challenge to do any planning before the event, except for the logistics of getting a wad of paper and pens together... Paper is ready, hoping to pick up some pens on a London trip on Wednesday.
Wish me luck!