How it works: Come along for 12:00pm and meet folk. At 12:20 GM touting starts. Everyone who is going to run something says what it is they will run, up to how many players can be accommodated and what the game is about.
It might be GM led or it might be more of a story game with the expectation that everyone contribute equally. When this is complete everyone says what it is they want to play. If there's more of us we'll use sign up sheet and if there are fewer then it's easy to sort out.
At 12:30 your group grabs a table and starts playing! The slot finishes around 4:30pm This process repeats at 5:00pm for the second slot.