All savvies know preparing a holiday dinner is The Mother Lode in the strata of culinary effort.  If you're a savvy guest this year rather than host or hostess with the mostess, be double-nice and bring along a savvy gift—around $20 is ideal—with your ingestible offering if you were invited to bring something.  Since some cultures consider it bad manners to bring wine, which implies that the host doesn't know what he's doing and other cultures think it's bad manners to bring flowers, which implies the hostess should cast hers aside and employ yours immediately, all of these are culture-neutral, handy-dandy items that don't imply immediate use.  Just a thoughtful, heartfelt thank you.  And that is all.