At my previous company, we had a hackathon where the theme was, more or less, bringing the company more together through technology. ~12 of us made 3 separate teams, came up with ideas, and worked like 12 hours on a Saturday hoping to be declared the winner.

When all was said and done, the judges—all non technical—took about 30 minutes to decide that it was a 3-way tie. If you're going to make something a competition, just pick a winner.