<p>The article describes an upcoming event featuring keynote speakers who are senior U.S. government officials. Specifically, the Secretary of State and the Defense Secretary are listed among the scheduled speakers. The event is part of broader celebrations marking the nation’s 250th birthday.</p>
<p>Additional details about the event, such as dates, locations, or the scope of activities, are not provided in the excerpt. The article focuses on the involvement of high-level officials in the festivities. <em>[unable to retrieve full-text content]</em></p>
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