Matzoh Ball
n. A Jewish party or dance held on Christmas Eve or Christmas Day.
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My brother Adam told me that it was traditional to hold Christmas Eve parties among Jewish singles living in Manhattan in the 1990s — after all, the following day was a day off from work. The parties were for Jews because Christians were assumed to be with their families on Christmas Eve. These parties were called "Matzoh Balls."
—Mitch Wagner, “Christmas for Jews,” Monkeys in My Pants, November 23, 2003
On the other side of town, at Club Medusa in Belltown, close to 500 Jews, aged 21 to 40, will gather for the annual "Matzoh Ball," a Christmas Eve social dance held in cities across the country.
—Jason Margolis, “Non-Christians gather to pray, to socialize or to help the needy,” The Seattle Times, December 24, 2002
1989 (earliest)
What started as an annual Christmas eve party, a "Matzo Ball," has evolved into a big boogie and social phenomenon that attracts Jews from as far as Rhode Island and Maine.
—Desiree French, “Bringing Jewish singles together,” The Boston Globe, July 17, 1989
The Matzoh Ball pun has been used as a joke punchline for many years, and has also been used to refer to non-Christmas Jewish parties (particularly around Passover) since at least the mid-80s, although probably long before that.

Thanks to subscriber b.santo for passing along the term and the link to Mitch Wagner's blog entry.
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