a party held at Christmastime and sponsored by a church, school, etc.
- c1958  Money for School Christmas Trees, which always ended in a dance, was raised by means of box socials mostly.
- 1882  The children . . . intend having a Xmas tree . . . at the church.
- 1916  No, he is up at the Hospital Christmas tree. . . .
- 1965  They . . . went to the hall for [the] Christmas tree. . . . all the kids were excited. . . .