I doubt very many artists would be interested in spending their night having awkward forced interactions with random brogrammers and Kalanicks at a corporate christmas party. There's a reason these companies have to pay women to show up and pretend to be interested in what their employees have to say.
Then you're "doing it wrong". Pay them to bring their art. Include them in the party (whatever degree of free drinks / food / access everyone else gets). Tell them that if someone's being a dick, they can feel free to be a dick right back.
Teach your people that no-one else is responsible for their happiness.
