Question: BD Performing Arts is the corporate entity that manages several performance groups for young people in Concord, the largest city in Contra Costa County, California, founded in which year?
Sentence (from "BD Performing Arts"): Included in these groups are the three Blue Devils Drum & Bugle Corps, designated "A", "B", and "C"; the Blue Devils International Corps; the Blue Devils Open Class, A Class, and Special Needs Winter Guards; the Diablo Wind Symphony; and BD Entertainment.
Relevant evidence: No