Visitors pack the National Mall in Washington to participate in a mile-long celebration of activities and entertainment.(Smithsonian Photo by Mark Avino)

The celebration tents line the National Mall in Washington, D.C., with the Washington Monument in the background.(Smithsonian Photo by Doc Dougherty)

Visitors dance together on the Mall during one of the many free concerts held during the weekend. (Smithsonian Photo #96-25432-3a by Mike Bryant)

A young visitor explores the world of stamps at the National Postal Musuem's area on the Mall. (Smithsonian Photo by Mark Avino)

The Smithsonian's Museums and offices were represented in hands-on areas where visitors could explore and learn. Here young visitors learn about "How Things Fly" from the staff of the National Air and Space Mseum. (Smithsonian Photo by Mark Avino)

Young archeologists dig for buried surprises. At the National Museum of Natural History Pavilion, visitors traveled through the world of nature and heard scientists talk about their discoveries. (Smithsonian Photo by Mark Avino)

A young artist at the celebration adds her contribution in the National Museum of American Art pavilion, one of the many tents stretching for a mile along the Mall. (Smithsonian Photo by Susan Bradley)

One of the thousands of visitors to the celebration...dressed as "Uncle Sam". (Smithsonian Photo by John Dillaber)

Visitors grab a quick nap after a day's activities on the Mall. (Smithsonian Photo #96-25356-9a by Mike Bryant)

As the sun begins to set, the crowd gathers in front of the Castle Stage to enjoy the evening's entertainment. (Smithsonian Photo #96-25369-11a by Neal Greentree)
Many of the visitors to the Mall during the celebration took advantage of the opportunity to become Smithsonian members.
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