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On Thursday, May 15, the 9/11 Memorial Museum will hold a 1-hour ceremony for invited guests. The ceremony will begin a week-long dedication period prior to the museum opening to the public on May 21. Invitations to the ceremony on May 15 have been sent to all living Presidents, federal, state, and local government officials, first responders, and some family members of 9/11 victims.May.15.2014