They perform the familiar songs fans love, as well as "stand by me " and "The Last Element", and promotion for tbe upcoming ending theme for chapter 5: "Ai Kotoba".(Thanks sc for the info )
For those who are disappointed for not able to watch the stage play, good news!
It's announced that there will be DVD release on December 2nd, 2017 for 9,504 yen.
Attendees will be able to preorder onsite with 2000 yen deposit, and there will be special event host for those who preorder on site with guests. The guests are the stage play actors for Taichi and Yamato.
The event is currently TBA, scheduled sometime in spring 2018.