Directly in the center of Festival Plaza is Festival Castle. In this castle are many different characters that will assist you in helping your Festival Plaza continue to grow. These characters and their assistance include the following:
Old Man: Will trade you a Bottle Cap in exchange for 30 Shards.
Top Left Character: Will assist you in paging a Guest or VIP to the castle.
Top Left Character: Will assist you in reorganizing shops and changing theme music.
Bottom Left Character: Will explain Festival Plaza Features.
Bottom Right Character: Will assist you in participating in Global Missions.
Top Right Character: Will assist you in participating in the Battle Agency.
Any player you have had some sort of interaction with will also go to Festival Castle, and you can check their records and earn Festival Coins by speaking to them. The PC can be used to activate Game Sync and view Battle Videos.