There are about 67 horrible earworm-y ways to open this challenge, but that's a horrible thing to do to all you wonderful people at the start of a brand spanking new year.
So instead, we're asking you to help throw a party. Or rather, to help the Doctor and Jack throw a party, and come on, the possible innuendos are just going begging at this point. Take them to the greatest party in nine galaxies - or the eternal gig at the Restaurant at the End of the Universe! Have them celebrate a quiet anniversary, or a near-escape, or all the folks they loved along the way - or just celebrate each other.
Whatever you do, I know it's going to be a great time. :D
As a gentle reminder, please don't crosspost stories for this challenge elsewhere until the challenge closes about one month from now. And don't forget - leave a comment in THIS post and tell us what you think the next challenge should be!