Christmas party, as the host, how to enliven the atmosphere?

Good eloquence and flexible mind can enliven the atmosphere in minutes. Really can't. You should prepare some funny jokes, such as funny stories about Christmas, but don't finish the story at once. You can stop at the wonderful place to observe everyone's expressions, and then continue. In fact, when the host has a partner, you can discuss with each other and design two people to echo when they should echo, or make fun of each other.