It's a simple plan: propose, plan a ball, ensure his friend's happiness. If only simple meant easy.
Mr. Bingley has returned to Netherfield as he promised, and he has come alone. However, he is planning to have guests. First, he will need to secure Miss Bennet's acceptance of his proposal. Then, he'll have to rid the area of a particular scoundrel. And then? Well, then, he can work on ensuring his friend's happiness.
In theory, it seems simple. In practice, it's going to take some quick thinking and shifting tactics to pull off the happiest Yuletide ball either he or his friend have ever attended.