Ealy, Gugu Mbatha-Raw, André Holland and Glynn Turman. Events depicted include William IV's royal assent to the UK Slavery Abolition Act in 1833, the 1955 lynching of 14-year-old Emmett Till in Mississippi, the release of Motown's first number-one song, “Please Mr. Postman” by The Marvellettes, Martin Luther King, Jr.'s 1963 "I Have a Dream" speech, the landfall of Hurricane Katrina in 2005 and the night then-senator Barack Obama accepted the Democratic nomination for president at the 2008 Democratic National Convention. On September 24, 2016, President Barack Obama formally opened the new museum along with four generations of the Bonner family, from 99-year-old Ruth Bonner to Ruth's great-granddaughter Christine. Together with the Obamas, Ruth and her family rang the Freedom Bell (rather than cut a ribbon) to officially open the museum. The bell came from the first Baptist church organized by and for African Americans, founded in 1776 in Williamsburg, Virginia, where at the time it was unlawful for blacks to congregate or preach. During his speech at the museum's opening, Obama shed tears discussing his thoughts on visiting the museum with future grandchildren. The total cost of the museum's design, construction, and installation of exhibits was $540 million ($ in dollars). By the time the museum's founding fundraising campaign had ended, the NMAAHC had raised $386 million ($ in dollars), 143 percent more than its goal of $270 million. Attendance and timed-entry ticketing More than 600,000 people visited the museum in its first three months. The Smithsonian required all visitors to have a ticket to access the museum. At first, the organization used pre-purchased timed-entry tickets, combined with a limited number of same-day tickets released every morning. The timed-entry tickets allowed visitors to enter at a specific time of day, with a shorter wait in line than would be expected if everyone showed up at the same time. Patron traffic proved so heavy that the NMAAHC began offering many fewer same-day tickets, and changed their release from early morning to early afternoon. After six months, 1.2 million people had visited the NMAAHC, making it one of the four most-visited Smithsonian museums. Patrons spent an average of six hours at the museum; twice as long as had been estimated before the museum's opening. The museum's popularity led to some problems. Visitors stood in line in the museum foyer to take an elevator down to the underground level. The exhibits start with