The Theme Chronicle event is now live, and so are the missions for the event:
-Inflict 8000 damage total to your opponent in Festival (200 gems)
-Activate a Spell/Trap Card in Festival 20 times (200 gems)
-Duel in Festival 20 times (200 gems)
-Win after going second in Festival 4 times (200 gems)

Furthermore, a new accessory is available:
Duel Field: Ursarctic Big Dipper

“A Duel Field featuring the spacefaring Ursarctic Big Dipper. These celestial defenders safeguard the stars’ memories.”
Price: 600 gems