From the Chaosium website:
Five Tales for a Not-So-Silent Night
Some time ago we asked you to submit adventures concerning the holiday season. This monograph contains five tales certain to scare the stockings off the mantle.
Silent Night
Set in Arkham in December of 2001, this tale involves four investigators gathered to celebrate the season, the mythos far away for the moment.
The Gaudy
The investigators are invited to Porterhouse College for a Christmas lecture series, and attendance at a great holiday feast called The Gaudy.
Christmas in Venice
Sometimes the merest glimpse of horror is enough to trigger dire events which make your trip to Venice a nightmare to forget.
Christmas in Kingsport
Snow falls over the seaport town, its winding streets covered with ribbons of white. Smoke rises from the chimneys with the smells of chestnuts, cookies, and roast goose filling the air. Once again the family is together again at the home of Great Aunt Norma.
A White Winter
The period following World War I finds a world in change; an exciting time to be alive. Revolutions sweep the collapsing empires of eastern Europe. This tale is set in 1919 in Siberia during the Russian civil war.