I've worked with teams on 48-hour film projects, in which you create a short (7 min) film in a weekend, quite comparable to a hackathon. On a team of 20 people,

I've worked with teams on 48-hour film projects, in which you create a short (7 min) film in a weekend, quite comparable to a hackathon. On a team of 20 people, we charge two participants fulltime with organising catering: healthy meals, snacks, etc. It really does wonders for the motivation and preventing cranky reactions from the stressed-out director of photography on Sunday afternoon