WASHINGTON (October 30, 2009)--About 2,000 schoolchildren from the Washington, D.C. area will be given a chance to knock on the White House door Saturday as part of their Halloween celebration.

The White House says the Obamas will have treats on hand for all of them.

Later, the president and first lady, as well as Vice President Joe Biden and his wife, Jill, are hosting a Halloween reception for military families and the children of White House and residence staff members.