This month the area’s museums are chock full of celebrations, openings, anniversaries and festivals. Enough to keep your dance card filled and your brain active.

>> The Natural History Museum describes the ocean as “a huge, awesome realm — sometimes mysterious but always amazing.” Their interpretation of the “awesome realm” will be shown in the long awaited opening of the Sant Ocean Hall on September 27. The exhibit represents the largest renovation in the museum’s 100-year history and is a must see upon completion. Check out a time lapse video of the exhibit’s construction over here.

>> The American Art Museum pairs two familiar artists in Georgia O’Keeffe and Ansel Adams: Natural Affinities. Compare and contrast their styles and compositions of natural settings. Opening September 26.

>> The National Postal Museum celebrates its 15th anniversary with Alphabetilately. The stamps, ephemera, and artifacts exhibited in Alphabetilately will graphically document the spectrum of the American experience, from historical subjects to popular culture, from actual events to important ideas. Opening September 26.

>> The Hirshhorn will host local art critic and DCist contributor Kriston Capps for a Friday gallery talk. Hear Kriston’s take on the Hirshhorn’s collection, September 19 at 12:30 p.m.