NSSE Event Notice:
Summer 2026 Events
Information about events to mark the 250th anniversary of the signing of the Declaration of Independence to come.
What is a National Special Security Event?
A National Special Security Event (NSSE) is an event of national or international significance deemed by the United States Department of Homeland Security (DHS) to be a potential target for terrorism or other criminal activity. These events may include summits of world leaders, meetings of international organizations, presidential nominating conventions, and presidential inaugurations. As the nation's capital, Washington, DC is frequently the setting for NSSE-designated events. This page will provide information on specific events as they are planned and executed. Learn more about the NSSE designation and preventing terrorism.