20th Century Fox and Post teamed up to promote the theatrical release of NIGHT AT THE MUSEUM: BATTLE OF THE SMITHSONIAN with an online instant win game. Contestants entered at www.WinASmithsonianSleepover.com. All winners were randomly selected. One Grand Prize winner received a four-day trip for six to Washington, D.C. with a one night sleepover at the Smithsonian museum, private screenings at the Smithsonian National Air and Space Museum's Imax Theater, guided tours of Washington, D.C. and at the Smithsonian National Air and Space Museum, and $1,700 in spending money. 300 First Prize winners received a $100 Museum Cash™ Card to spend at any museum or any merchant that accepts any major credit or debit card. 1,000 Second Prize winners a received glow-in-the-dark tee shirt. The promotion ran from April 1 through June 30, 2009.