Your first visit on the town square

Hint 1 of 6:

Talk to everybody and watch what happens.

Hint 2 of 6:

Do anyone want an item from your inventory?

Hint 3 of 6:

Or at least something similar?

Hint 4 of 6:

Give the baseball bat to the accordion player.

Hint 5 of 6:

Watch what happens and then listen to the dancers.

Hint 6 of 6:

Now, you will find a poster in the Street of Traders.