Lefotvers are often the best thing about holiday dinners. Reheated leftovers need to reach at least 160 degrees. Things like leftover gravy should not be reheated more than once. If you don't consume all the leftovers within three days, they should be thrown out. If you have a large amount of leftovers, freezing them is a good option.
Leftovers also make good carry-out items.
If you are taking food home from someone else's dinner table and you live more than a half hour away, make sure you have some means of refrigerating the food in your car. A cooler with ice should do the trick. If you don't have the facilities for refrigeration to keep cold foods cold or something like a crockpot to keep hot foods hot, then you better just think about bringing the chips.