what would be a good slogan for a christmas party/celebration?

Answer 1

This site will give you some ideas.

http://www.zazzle.com/christmas+slogan+tshirts

Depending upon the nature of the party and its attendants, you might also consider:

Peace on Earth begins with YOU.

Eat, Drink, Make Merry! Ho! Ho! Ho!

Let's put the CHRIST back in CHRISTMAS!

Answer 2

Thanks for the link, and your suggestions. The slogans you came up with are awesome.