On December 3, 1985, a 16 year old dropout named Louis Cartier entered the building with a shotgun, and was promptly killed by Concord police officers. No other fatalities occurred in the shooting, other than Cartier. During the 1999-2000 school year, teacher Joanne McGlynn's media literacy class gained nationwide prominence when its students fact-checked claims made in the media about a quote regarding the "Love Canal" that
Al Gore had made when addressing the school. At Concord High's first dance of the 2006–2007 school year, the school drew local media attention when administration ejected about a dozen students for
grinding, a style of dancing that the administration deemed overly sexual for a school function. In protest of this, about 150 other students walked out of the dance. The administration met with student body leaders to try to reach an agreement. They were not able to, and for the first time in the school's history, the homecoming dance was postponed, and every other dance that year was canceled. An exception was made for the senior prom, however. Another notable event which occurred at Concord High School was the resignation of Principal Tom Sica. Sica had been the principal of Rundlett Middle school before moving up to Concord High School in 2016. During his time as principal at Rundlett, allegations of
sexual assault and misconduct were placed upon a teacher, Howie Leung. The student who brought this to Sica's attention was promptly suspended for three days for "spreading 'malicious and slanderous gossip'". Once he had moved to the high school, news of this suspension, and the circumstances surrounding it, were brought to the public, leading to outrage in the Concord community. Leung was arrested in 2019 for sexual assault charges, and pled "not guilty". == Notable alumni and faculty ==