I'm semi-surprised to see we don't have a thread on the original Night at the Museum (2006). Anyhoo, link to the thread on Enchanted (2007).

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Amy Adams visits 'Museum 2'
Amy Adams is in negotiations to star opposite Ben Stiller in 20th Century Fox's "Night at the Museum 2." Pic kicks off when the artifacts from the Museum of Natural History are boxed up and sent to the archives at the Smithsonian in Washington. Adams will play an undetermined historical figure who has a crush on security guard Larry (Stiller).
Variety, February 4

'Museum' sequel pens Guest
Christopher Guest is taking it up to 11 for Fox's sequel to "Night at the Museum."
The "Spinal Tap" star has joined the cast as Ivan the Terrible for the comedy adventure, officially titled "Night at the Museum: Battle of the Smithsonian."
Also joining the cast are Jon Bernthal (Al Capone), Bill Hader (Gen. George Armstrong Custer) and French actor Alain Chabat (Napoleon).
The film, directed by Shawn Levy, reunites lead Ben Stiller with castmates Robin Williams, Ricky Gervais and Owen Wilson.
Robert Ben Garant and Thomas Lennon, who penned both "Museum" films, will make a cameo in the sequel, playing the Wright brothers. . . .
Hollywood Reporter, July 1

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This is kind of amusing, as Owen Wilson played one of the Wright brothers himself, in Around the World in 80 Days (the other brother was played by LUKE Wilson).

No link to the original film?

I watched it two nights ago and can see why. It's not very good. But it was HUGELY popular, so the lack of a dedicated thread is a little surprising.