Sorry Sprout don't want you to feel lonely. This will be my 24th Christmas since having children so the routine/traditions are well established and the DC would riot if I tried to deviate too much. That means that my plans pretty much write themselves. I do love following what other people do - just in case there is something I can add even if I can't take anything away 
We both have large families but the extended gift list is fairly modest. Just our DMs and then any children in the family.
We do a two night visit "back home" in between Christmas and New Year. My lovely SIL and BIL host a party where we see all the in laws in one fell swoop and spend the other day seeing my DM and any of my siblings that are around.
My youngest is 10 (currently in year 5) and we still do Santa and stockings but my adult DDs pitch in and they do stockings for me and DH.
We have a cinema trip followed by a meal out to start the holidays once school and work break up. This year (like the last two) it will be the New Star Wars film.
One thing I do is to say that lists for Santa have to be written by 30th November as they are left out and "swapped" for the advent calendar. I have a permanent calendar that I made from a kit about 5 years ago (possibly more). DS was very impressed that "Santa" put two things in each pocket at the start of the month but there were three things starting from the morning after DD1 returned from uni 