Hackathon for games. Bunch of people meet up and make a game from the ground up. Typically for a weekend but sometimes longer. At the end everyone shows off

Hackathon for games. Bunch of people meet up and make a game from the ground up. Typically for a weekend but sometimes longer. At the end everyone shows off what they made. Notably while you do divide up into teams in a game jam, and they might even give out prizes, game jams are not thought of as a competitive event. It's very common artists and musician to contribute to multiple teams, programmers help others with stuff they specialize in, everyone is always getting feedback and playtests from others, etc.