“This hackathon is for projects you're just starting.”
From the more details page after you click through the link
From the more details page after you click through the link
Of course no one's going to check if you worked on it last night or whatnot (I know friends who've taken previous hackathon submissions and submit it to hackathons like it's new and actually won) but for the hackathon spirit you shouldn't.
I imagine with a ycombinator interview on the line that sort of behavior will only be more prevalent.