Stock market closures are rare outside of regular holidays. Other events that closed the market include Hurricane Sandy and the September 11 attacks.

Jan. 9, federal departments and agencies will close in observation of the former president’s death as he lays in state in Washington, D.C.

Stock markets and the Postal Service will be closed on January 9 to mourn the death of Jimmy Carter. Here’s what else to know about the National Day of Mourning.