If you're socially awkward and find yourself struggling to strike up a conversation, here are four topics you can bring up...
1. Ask what they're drinking. (Works better if they've got a cocktail in their hand rather than a beer)
2. Ask how they know the host. Whatever their answer is, it'll probably lead to another topic.
3. Talk about the food or the music. Something like, "Are you sick of all this Christmas music yet?" I know I am...
4. Ask what they're doing for the holidays. They'll either be excited about them or ANNOYED about having to travel and deal with family.