Sandy Hook Promise 10 Year RemembrancePhoto bySandy Hook Promise/Twitter. December 14, 2022 will mark the ten year anniversary of the Sandy Hook Elementary School shooting in Newtown, Connecticut. A memorial opened almost 10 years after 26 adults and children were killed. A memorial to the 20 first graders and 6 educators killed in the Sandy Hook shooting has opened to the public, in November, a month before the 10th anniversary of the massacre, as reported by ABC News.