If you click on episodes at NBC.com, and then choose the December 11 airdate, you can get a summary for Episode 9:
"Season 7 Episode 2T6-209
THE WEDDING 8/7pm 12/11/05
BARTLET MANAGES PEACE BETWEEN CHINA AND RUSSIA OVER OIL/A WHITE HOUSE WEDDING - Bartlet (Martin Sheen) must try to rectify a disintegrating situation between China and Russia over oil while his daughter gets married in the White House. Josh (Brad Whitford) struggles with dwindling campaign funds and the necessary ad buys. Also starring Allison Janney, John Spencer, Jimmy Smits, Mary McCormack, Stockard Channing. TV-PG"