We travel some years. The Christmas Eve hamper works well for us (we usually rent a cottage between both sets of parents) and is easily transportable. This year we'll be staying in 1 parents house (not sure if DH's or mine yet) but I intend continuing most of that (new PJs and bath treat for all 3 of us, naice hot choc, DD's stocking and Twas the Night Before Christmas for bedtime at least). I may increase the hot choc rations to everyone in the house, and if I know in advance (and am organized enough), I MAY extend the PJs to everyone (but downgrading to Penneys seasonal kitsch chic!).
A long walk on Boxing Day is a must, regardless of where we are.
In DPILs house, all presents are thrust into your hands as you walk in the door, whereas in DPs house, they are handed around individually in the late afternoon. Stockings still exist in DPs house (sweets, fruit and a book) for any "DCs" (children of my DPs - all now well into adulthood!) while DMIL gives all her DCs and DCILs socks and jocks (boys) or pants and tights (girls). Well, DCILs don't get underwear, just foot coverings...
Also, DPIL eat in the middle of the day, whereas DPs eat in the evening (with bets on for the time we sit down at - winners are usually in the range 9-10.30pm!!). But visitors come to DPs house in the morning (drinks and nibbles) or DPILs in the afternoon (tea and cake after graveyard visit).
We have a mix of traditions, and because both houses do things at different times etc, we can mix those too (although it ALWAYS means 2 plates piled high with turkey, even if we are officially eating in 1, we have to have a "snack" in the other!!). Mostly it's a similar mix when we are at home in our own house too.
And all do mass on Christmas morning, so that is something we can keep everyone happy on!