Photo by John Sonderman.

The African American History And Culture Museum is sending out a “save the date” for its big day. The official opening: September 24.

That means that President Barack Obama will still be in office to lead the dedication ceremony. Afterward, there will be a week of celebrations, an outdoor festival, and a period where the museum will be open for 24 hours straight, Smithsonian spokeswoman Linda St. Thomas told the Associated Press.

For an early look at what visitors might expect, the African American History And Culture Museum has a gallery on view at the National Museum of American History that is culled from their permanent collection.

Then-President George W. Bush authorized the Smithsonian Institution’s 19th facility in 2003, and he joined President Obama and then-Mayor Vincent Gray in breaking ground on the museum in 2012.

The Smithsonian celebrated the completion of the exterior of the museum in November with a three-night exhibition projected on its walls.

About half of the museum is below grade, hiding much of the building’s mass and allowing for a multi-level history gallery. And architect David Adjaye gave much consideration to how the site opens up to the monumental grounds next door.

“Conceptually, we have a pavilion freestanding on a rolling green landscape,” Jud McIntire, an architect and the project manager for the site, told DCist last year. “When you view all this from 14th and Constitution, you get this open vista across the grounds. The landscape and the earth is kind of as powerful as the form of the building.”

After you visit, the New York Times ridiculously recommends checking out CityCenterDC.