One of the parents field the lawsuit on Thursday seeking damages for the student that was hurt during the collapse.
Superintendent Keen said 16 of the 17 injured students have since returned to school.
Two of the high school students who performed the night of the collapse, sang at the one year anniversary celebration for the Grand Junction Brewing Company.
No timeline has been released yet on when the determination on a cause might be made.
The injuries will heal and so will the community.
He said every structure has its limits and the key is being prepared come show time.
Investigators and forensic engineering are looking at the structure of the stage and are collecting inspection records.
Pence said that the State Fire Marshal, Indiana State Police and Indiana Occupational Safety and Health Administration will review the incident.
Video showed about 250 girls from Rosary High School performing at a rally at Servite High School when the stage collapsed into the orchestra pit.
Reid Markus suffered a fractured femur and sprained wrist.