Christmas 2017 Event Re-Run/Free Quest

First Gate
Clear Chapter 2 to unlock

Second Gate
Clear Chapter 3 to unlock

Third Gate
Clear Chapter 4 to unlock

Fourth Gate
Clear Chapter 5 to unlock

Fifth Gate
Clear Chapter 6 to unlock

Sixth Gate
Clear Chapter 6 to unlock

Seventh Gate
Clear Chapter 7 to unlock

Secret Party
Clear Main Story to unlock