We do a Provencal tradition (featured in BBC Good Food magazine many years ago) called treize desserts (imagine the accents on two of those es). Three fresh fruits, three nuts, three dried fruits, three sweetmeats and a centrepiece.
Ours are grapes, tangerines, pomegranate; hazelnuts, walnuts, brazils (except the year we couldn't get brazils so had pistachios instead which several people preferred); figs, dates, apricots; shortbread, Finnish spice biscuits, Viennese truffles; and the Christmas pudding, because for several years both of us felt we couldn't do it justice after a massive dinner.
Served with a bowl of whipped cream (largely for the pomegranate seeds, but goes well with everything else too
) and custard for the pudding. Some sort of nice drink - S1 likes interesting cordials, S2 is happy with coke, or they might have hot chocolate; we get a dessert wine or use the parsnip sherry.
Partly because of this we have a fry-up for early lunch, though I imagine guests "arriving on Christmas Eve" won't be around for lunch?