This was the secret Tim Burton Alice In Wonderland party that was thrown back in 2008 or 2009 I think. It was kept secret because of the economic downturn and muh optics. There are several articles out on it. The party was held I believe just before the movie was released. It has been posted about here before.
https://nypost.com/2012/01/08/white-house-threw-secret-alice-in-wonderland-bash-during-recession/