There were two seperate parties. One for the press and public to look at, and the creepy, gaudy, over the top hollywood bash inside that the public was not told about, hence the reason they were not on the log books.
That's what I thought!
“White House officials were so nervous about how a splashy, Hollywood-esque party would look to jobless Americans — or their representatives in Congress, who would soon vote on health care — that
the event was not discussed publicly and Burton’s and Depp’s contributions
went unacknowledged,” the book says.
However, the White House made certain that more humble Halloween festivities earlier that day — for thousands of Washington-area schoolkids — were well reported by the press corps.
Then the Obamas went inside, where an invitation-only affair for children of military personnel and White House administrators unfolded in the East Room.
Unknown to reporters, the State Dining Room had also been transformed into a secretive White House Wonderland.
http://www.nypost.com/p/news/national/in_blunderland_hKpNQkHfvpEWe4F51kI4dP#ixzz1iu6qw4Fh