Conan O'Brien is to serve as host of the program, which will air on the cable network Dec. 16, five days after it is taped at the National Building Museum in Washington.
"Celebrating its 30th anniversary this year, 'Christmas in Washington' is a holiday tradition benefiting the Children's National Medical Center," TNT said in a news release.
The network notes the concert is attended each year by the president and first lady and other high-profile Washington officials and celebrities.
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