In the beginning we walked around, trying to interact with the people and objects. There are some vending machines in every Stage, but they were all disabled for this festival.
Interaction with other players is extremely limited:
1. We can say something (30 letters) in a text bubble.
2. We can add a friend.
3. We can check another player's information such as win-rate and spoken language.
And thats about it!
There are 25 tables, enough for 50 battling players. To battle another player, we simply had to choose a table and sit at the opposite of another player, and then click on that player and select Battle. We had a hard time not knowing this at first but the Staffs were generally very kind, walking around providing help to the needy.
If you are too tired to play, you can also spectate another player's game by clicking on a sitting player and selecting Spectate. When spectating, the board of both players are shown simultaneously (side-by-side) and their conversation can be heard.